Completed
Last Updated: 21 Mar 2019 15:08 by ADMIN
Release 2019.1.318 (03/18/2019)

1. Run the project and press "a" in the editable part of RadMultiColumnCombobox.

2. Press Tab. As a result you will notice that no selection will be available. If you run the project with a version prior to R2 2018 (version 2018.2.515), the selection will be kept.

Completed
Last Updated: 16 May 2019 08:54 by ADMIN
Release R1 2019
Workaround: 

protected override void OnShown(EventArgs e)
{
    base.OnShown(e);

    LightVisualElement lve = this.radMultiColumnComboBox1.MultiColumnComboBoxElement.TextboxContentElement;
    RadArrowButtonElement arrow = this.radMultiColumnComboBox1.MultiColumnComboBoxElement.ArrowButton;
    lve.MaxSize = new Size(lve.Size.Width - arrow.Size.Width - (int)arrow.Border.Width, 0);
}
Completed
Last Updated: 22 Aug 2018 08:20 by Dimitar
Use attached to reproduce!

Workaround 
The column name must match the field name.
Completed
Last Updated: 10 Aug 2018 09:08 by Dimitar
To reproduce: 
- Set the DropDownStyle to DropDownList
Completed
Last Updated: 20 Jul 2018 08:09 by Dimitar
To reproduce: run the attached project and refer to the attached gif file.

Workaround:

 this.radMultiColumnComboBox1.MultiColumnComboBoxElement.TextBoxElement.TextBoxItem.TextBoxControl.MouseDown += TextBoxControl_MouseDown;

        private void TextBoxControl_MouseDown(object sender, MouseEventArgs e)
        {
            this.radMultiColumnComboBox1.MultiColumnComboBoxElement.TextBoxElement.TextBoxItem.TextBoxControl.SelectAll();
        }
Completed
Last Updated: 14 Jan 2019 11:59 by ADMIN
To reproduce: 
- When the filter is set to contains the item is different than the item is selected from the drop-down and the text is taken from the append functionality.

Workaround
Either change the filter to StarrtsWith or remove the suggest functionality. 
Completed
Last Updated: 15 Mar 2018 12:07 by Dimitar
To reproduce:

            this.radMultiColumnComboBox1.DataSource = this.customersBindingSource;
            this.radMultiColumnComboBox1.DisplayMember = "CustomerID";
            this.radMultiColumnComboBox1.AutoFilter = true;

            FilterDescriptor filter = new FilterDescriptor();
            filter.PropertyName = this.radMultiColumnComboBox1.DisplayMember;
            filter.Operator = FilterOperator.Contains;
            this.radMultiColumnComboBox1.EditorControl.MasterTemplate.FilterDescriptors.Add(filter);

1. Click the dropdown button, verify that all items list on drop down
2. Type into the textbox so only one item is left( e.g. "BERGS" )
3. While the drop-down is still opened, click the arrow button.
4. Focus another control on the form and then when the user clicks the arrow button, only one item is still shown in the drop down. 

Workaround:
        private void radMultiColumnComboBox1_DropDownClosed(object sender, RadPopupClosedEventArgs args)
        {
            this.radMultiColumnComboBox1.EditorControl.MasterTemplate.Refresh();
        }
Completed
Last Updated: 03 Jul 2017 12:27 by ADMIN
To reproduce: please refer to the attached sample project and refer to the screenshot. You will notice that initially, the arrow is a few pixels up. If you disable and then enable the RadMultiColumnComboBox again you will notice the difference.
Workaround:

        private void radToggleButton1_ToggleStateChanged(object sender, Telerik.WinControls.UI.StateChangedEventArgs args)
        {
            ImagePrimitive img = this.radMultiColumnComboBox1.MultiColumnComboBoxElement.ArrowButton.FindDescendant<ImagePrimitive>();
            img.Margin = new Padding(0);
            if (args.ToggleState == Telerik.WinControls.Enumerations.ToggleState.On)
            {
                this.radMultiColumnComboBox1.Enabled = true;
                this.radMultiColumnComboBox1.MultiColumnComboBoxElement.ArrowButton.Padding = new Padding(0);
            }
            else
            {
                this.radMultiColumnComboBox1.Enabled = false; 
            }
        }
Completed
Last Updated: 15 Aug 2017 10:54 by ADMIN
To reproduce: please refer to the attached sample project which result is illustrated in the attached gif file. The DropDownClosed is expected to be fired when the drop down is already closed. Hence, showing a message box shouldn't keep the drop down opened. The problem is reproducible with RadDropDownList as well. Note that this problem is not applicable for MS ComboBox.

Workaround:  this.radMultiColumnComboBox1.MultiColumnComboBoxElement.DropDownAnimationEnabled = false;
Completed
Last Updated: 19 Jun 2017 12:09 by ADMIN
To reproduce: please refer to the attached sample project and try to enter some numeric value or clear the existing one. Then open the popup.

Workaround: use the custom filtering that RadGridView offers http://docs.telerik.com/devtools/winforms/gridview/filtering/custom-filtering

this.radMultiColumnComboBox1.AutoFilter = true;
FilterDescriptor filter = new FilterDescriptor();
filter.PropertyName = this.radMultiColumnComboBox1.DisplayMember;
filter.Operator = FilterOperator.Contains;
this.radMultiColumnComboBox1.EditorControl.MasterTemplate.FilterDescriptors.Add(filter);
this.radMultiColumnComboBox1.EditorControl.EnableCustomFiltering = true;
this.radMultiColumnComboBox1.EditorControl.CustomFiltering += EditorControl_CustomFiltering;

string search = string.Empty;

private void EditorControl_CustomFiltering(object sender, Telerik.WinControls.UI.GridViewCustomFilteringEventArgs e)
{
    search = this.radMultiColumnComboBox1.MultiColumnComboBoxElement.EditorElement.Text;
    if (search != string.Empty)
    {
        e.Handled = true;
        e.Visible = e.Row.Cells[this.radMultiColumnComboBox1.DisplayMember].Value.ToString().Contains(search);
    }
    else
    {
        e.Handled = false;
    }
}
Completed
Last Updated: 19 Jun 2017 12:05 by ADMIN
To reproduce: 

            DataTable dt = new DataTable();

            dt.Columns.Add("ID");
            dt.Columns.Add("Description");

            dt.Rows.Add(new object[] { "0", "Low" });
            dt.Rows.Add(new object[] { "1", "Medium" });
            dt.Rows.Add(new object[] { "2", "High" });
            radMultiColumnComboBox1.DisplayMember = "ID";
            radMultiColumnComboBox1.ValueMember = "ID";
            radMultiColumnComboBox1.DataSource = dt;
            radMultiColumnComboBox1.SelectedValue = "1";

 this.radMultiColumnComboBox1.SelectedValueChanged+=radMultiColumnComboBox1_SelectedValueChanged;

        private void radMultiColumnComboBox1_SelectedValueChanged(object sender, EventArgs e)
        {
            Console.WriteLine(this.radMultiColumnComboBox1.SelectedValue);
        }

If you type 2 in the editable part, the SelectedValue is not changed as in the previous version.

Workaround:

public class MyRadMultiColumnComboBox : RadMultiColumnComboBox
{
    public override string ThemeClassName
    {
        get
        {
            return typeof(RadMultiColumnComboBox).FullName;
        }
    }

    protected override RadMultiColumnComboBoxElement CreateMultiColumnComboBoxElement()
    {
        return new MyRadMultiColumnComboBoxElement();
    }
}

public class MyRadMultiColumnComboBoxElement : RadMultiColumnComboBoxElement
{
    protected override Type ThemeEffectiveType
    {
        get
        {
            return typeof(RadMultiColumnComboBoxElement);
        }
    }

    protected override void SetActiveItem(string text)
    {
        int rowIndex = this.FindItemIndexExact(text);

        if (rowIndex != -1)
        {
            this.EditorControl.CurrentRow = this.EditorControl.Rows[rowIndex];
            this.textBox.SelectionStart = this.textBox.Text.Length;
        }
    }
}
Completed
Last Updated: 26 Jan 2017 08:51 by ADMIN
How to reproduce: check the attached project and video

Workaround: create a custom RadMultiColumnComboBoxElement
Public Class MyRadMultiColumnComboBox
    Inherits RadMultiColumnComboBox

    Public Overrides Property ThemeClassName As String
        Get
            Return GetType(RadMultiColumnComboBox).FullName
        End Get
        Set(value As String)
            MyBase.ThemeClassName = value
        End Set
    End Property

    Protected Overrides Function CreateMultiColumnComboBoxElement() As RadMultiColumnComboBoxElement
        Return New MyRadMultiColumnComboBoxEleemnt()
    End Function
End Class

Class MyRadMultiColumnComboBoxEleemnt
    Inherits RadMultiColumnComboBoxElement

    Protected Overrides ReadOnly Property ThemeEffectiveType() As Type
        Get
            Return GetType(RadMultiColumnComboBoxElement)
        End Get
    End Property

    Protected Overrides Sub SetActiveItem(item As String)
        Dim rowIndex As Integer = Me.FindItemIndexExact(Text)

        If rowIndex <> -1 Then
            Me.textBox.SelectionStart = Me.textBox.Text.Length
        End If
    End Sub
End Class
Completed
Last Updated: 27 Dec 2016 11:01 by ADMIN
Workaround: create a custom RadMultiColumnComboBox control with a custom element. You can also check the attached project.

public class MyRadMultiColumnComboBox : RadMultiColumnComboBox
{
    public override string ThemeClassName
    {
        get
        {
            return typeof(RadMultiColumnComboBox).FullName;
        }
    }

    protected override RadMultiColumnComboBoxElement CreateMultiColumnComboBoxElement()
    {
        return new MyRadMultiColumnComboBoxElement();
    }
}

public class MyRadMultiColumnComboBoxElement : RadMultiColumnComboBoxElement
{
    protected override Type ThemeEffectiveType
    {
        get
        {
            return typeof(RadMultiColumnComboBoxElement);
        }
    }

    protected override void ProcessKeyDown(object sender, KeyEventArgs e)
    {
        base.ProcessKeyDown(sender, e);

        if (this.IsPopupOpen && (e.KeyCode == Keys.PageDown || e.KeyCode == Keys.PageUp))
        {
            this.EditorControl.GridBehavior.ProcessKey(e);
        }
    }
}
Completed
Last Updated: 08 Apr 2019 16:26 by ADMIN
Release R2 2019 (LIB 2019.1.415)
Completed
Last Updated: 01 Nov 2016 07:27 by ADMIN
When you set the DropDownHeight property to a big number that exceeds the screen's height, the applied values is SystemInformation.WorkingArea.Height - 100 . However, it should be only SystemInformation.WorkingArea.Height. These 100 pixels shouldn't be lost.

NOTE: the same behavior is observed with DropDownWidth as well.

Workaround:

Public Class CustomMultiColumn
Inherits RadMultiColumnComboBox

    Protected Overrides Function CreateMultiColumnComboBoxElement() As RadMultiColumnComboBoxElement
        Return New CustomRadMultiColumnComboBoxElement()
    End Function

    Public Overrides Property ThemeClassName As String
        Get
            Return GetType(RadMultiColumnComboBox).FullName
        End Get
        Set(value As String)
            MyBase.ThemeClassName = value
        End Set
    End Property
End Class

Public Class CustomRadMultiColumnComboBoxElement
Inherits RadMultiColumnComboBoxElement
    Protected Overrides Function GetPopupSize(popup As RadPopupControlBase, measure As Boolean) As Drawing.Size
        Dim s As Size = MyBase.GetPopupSize(popup, measure)
        Return New Size(s.Width, Math.Min(SystemInformation.WorkingArea.Height, Me.DropDownHeight))
    End Function

    Protected Overrides ReadOnly Property ThemeEffectiveType As Type
        Get
            Return GetType(RadMultiColumnComboBoxElement)
        End Get
    End Property
End Class
Completed
Last Updated: 19 Jul 2016 14:16 by ADMIN
To reproduce:

public Form1()
{
    InitializeComponent();

    DataTable dt = new DataTable();
    dt.Columns.Add("Id", typeof(int));
    dt.Columns.Add("Name", typeof(string));
    for (int i = 0; i < 20; i++)
    {
        dt.Rows.Add(i, "Item" + i);
    }
    this.radMultiColumnComboBox1.DataSource = dt;
    this.radMultiColumnComboBox1.DisplayMember = "Name";
    this.radMultiColumnComboBox1.ValueMember = "Id";
    this.radMultiColumnComboBox1.SelectedValueChanged += radMultiColumnComboBox1_SelectedValueChanged; 
}

private void radMultiColumnComboBox1_SelectedValueChanged(object sender, EventArgs e)
{ 
    if (this.radMultiColumnComboBox1.SelectedIndex > -1)
    {
        MessageBox.Show("Test");
    }
}

NOTE: If you use a RadMessageBox, after showing the message the first time, the popup can't be closed because InvalidOperationException is thrown.

Workaround: show the message box in the RadMultiColumnComboBox.DropDownClosed event.
Completed
Last Updated: 07 Nov 2019 14:16 by ADMIN
Release R1 2020 (LIB 2019.3.1111)
To reproduce:
- Open the attached project.
- Type a text so there are no results in the drop down.
- Press Enter.
- Click the arrow button.

Workaround: 
private void RadMultiColumnComboBox1_DropDownOpened1(object sender, EventArgs e)
{
    if (radMultiColumnComboBox1.Text == "")
    {
        radMultiColumnComboBox1.EditorControl.FilterDescriptors.Clear();
        CompositeFilterDescriptor compositeFilter = new CompositeFilterDescriptor();
        compositeFilter.FilterDescriptors.Add(new FilterDescriptor("Drug", FilterOperator.StartsWith, ""));
        compositeFilter.FilterDescriptors.Add(new FilterDescriptor("Name", FilterOperator.StartsWith, ""));
        compositeFilter.LogicalOperator = FilterLogicalOperator.Or;
        radMultiColumnComboBox1.EditorControl.FilterDescriptors.Add(compositeFilter);
    }
}
Completed
Last Updated: 08 Jan 2016 06:29 by ADMIN
Steps to reproduce:
1. Select the radMultiColumnsComboBox1 at Design time
2. Press F4 for showing Properties
3. Open Columns editor (GridViewDataColumn Collection Editor)
4. Try to add a column
Error Message: Cannot create an instance of the abstract class or interface 'Telerik.WinControls.UI.GridViewDataColumn' because it is an abstract class.
Completed
Last Updated: 15 Feb 2019 16:41 by ADMIN
ADMIN
Created by: Dess | Tech Support Engineer, Sr.
Comments: 3
Category: MultiColumnCombo
Type: Bug Report
5
To reproduce:

Repository commonRepository = new Repository();

public Form1()
{
    InitializeComponent();

    InitializeDropDown();

    this.radMultiColumnComboBox1.DropDownMinSize = new Size(1100, 400);
    this.radMultiColumnComboBox1.EditorControl.ViewCellFormatting += EditorControl_ViewCellFormatting;
}

private void EditorControl_ViewCellFormatting(object sender, CellFormattingEventArgs e)
{
    if (e.Row is GridViewDataRowInfo && e.CellElement is GridRowHeaderCellElement)
    {
        e.CellElement.Text = e.RowIndex.ToString();
    }
}

public class Instrument
{ 
    public string Isin { get; set; }

    public string Description { get; set; }
    
    public string AlphaCode { get; set; }
    
    public string MicMarketplaceCode { get; set; }
    
    public string WorpMarketPlaceDescription { get; set; }
     
    public string InstrumentType { get; set; }
   
    public string DerivateIsin { get; set; }
    
    public int Order { get; set; }
}

public class Repository
{
    public BindingList<Instrument> GetInstruments()
    {
        Random rand = new Random();
        BindingList<Instrument> list = new BindingList<Instrument>();
        for (int i = 0; i < 80000; i++)
        {
            list.Add(new Instrument()
            {
                Isin = Guid.NewGuid().ToString(),
                Description = "Description" + i,
                AlphaCode = "Code" + i,
                MicMarketplaceCode = "MicCode" + i,
                WorpMarketPlaceDescription = "MPdescription" + i,
                InstrumentType = "Type" + i % 3,
                DerivateIsin = Guid.NewGuid().ToString(),
                Order = rand.Next(1, 100)
            });
        }
        return list;
    }
}

public void InitializeDropDown()
{
    var ui = TaskScheduler.FromCurrentSynchronizationContext();

    Task.Factory.StartNew(() =>
    {
        var result = commonRepository.GetInstruments();
        return result;
    }).ContinueWith(res =>
    {
        if (res.IsCompleted)
        {
            this.radMultiColumnComboBox1.DisplayMember = "Description";
            this.radMultiColumnComboBox1.ValueMember = "Isin";
            this.radMultiColumnComboBox1.AutoFilter = true;

            this.radMultiColumnComboBox1.DataSource = res.Result;

            CompositeFilterDescriptor compositeFilter = new CompositeFilterDescriptor();

            FilterDescriptor code = new FilterDescriptor("Isin", FilterOperator.Contains, "");
            FilterDescriptor description = new FilterDescriptor("Description", FilterOperator.Contains, "");
            FilterDescriptor alphaCode = new FilterDescriptor("AlphaCode", FilterOperator.Contains, "");
            FilterDescriptor micMarketplaceCode = new FilterDescriptor("MicMarketplaceCode", FilterOperator.Contains, "");
            FilterDescriptor worpMarketPlaceDescription = new FilterDescriptor("WorpMarketPlaceDescription", FilterOperator.Contains, "");
            FilterDescriptor instrumentType = new FilterDescriptor("InstrumentType", FilterOperator.Contains, "");
            FilterDescriptor derivateIsin = new FilterDescriptor("DerivateIsin", FilterOperator.Contains, "");

            compositeFilter.FilterDescriptors.Add(code);
            compositeFilter.FilterDescriptors.Add(description);
            compositeFilter.FilterDescriptors.Add(alphaCode);
            compositeFilter.FilterDescriptors.Add(micMarketplaceCode);
            compositeFilter.FilterDescriptors.Add(worpMarketPlaceDescription);
            compositeFilter.FilterDescriptors.Add(instrumentType);
            compositeFilter.FilterDescriptors.Add(derivateIsin);

            compositeFilter.LogicalOperator = FilterLogicalOperator.Or;

            this.radMultiColumnComboBox1.EditorControl.FilterDescriptors.Add(compositeFilter);

            this.radMultiColumnComboBox1.EditorControl.BestFitColumns();

            for (int i = 0; i < this.radMultiColumnComboBox1.EditorControl.Columns.Count; i++)
            {
                var column = this.radMultiColumnComboBox1.EditorControl.Columns[i];

                switch (column.Name)
                {
                    case "Isin":
                        column.HeaderText = "Header Isin";
                        column.Width = 120;
                        break;
                    case "Description":
                        column.HeaderText = "Header Description";
                        break;
                    case "AlphaCode":
                        column.HeaderText = "Header AlphaCode";
                        break;
                    case "MicMarketplaceCode":
                        column.HeaderText = "Header MicMarketplaceCode";
                        break;
                    case "WorpMarketPlaceDescription":
                        column.HeaderText = "Header WorpMarketPlaceDescription";
                        break;
                    case "InstrumentType":
                        column.HeaderText = "Header InstrumentType";
                        break;
                    case "DerivateIsin":
                        column.HeaderText = "Header DerivateIsin";
                        break;
                    case "Order":
                        column.IsVisible = false;
                        break;
                }
            }

            this.radMultiColumnComboBox1.SelectedItem = null;

            this.radMultiColumnComboBox1.Text = "Instrument";
            this.radMultiColumnComboBox1.ForeColor = Color.Gray;

            this.radMultiColumnComboBox1.MultiColumnComboBoxElement.DropDownWidth = 550;
        }
        else
        {
            RadMessageBox.Show(res.Exception.Message);
        }
    }, ui);
}

Workaround: use custom filtering instead of CompositeFilterDescriptor:

FilterDescriptor filter = new FilterDescriptor();
filter.PropertyName = this.radMultiColumnComboBox1.DisplayMember;
filter.Operator = FilterOperator.Contains;
this.radMultiColumnComboBox1.EditorControl.MasterTemplate.FilterDescriptors.Add(filter);
this.radMultiColumnComboBox1.EditorControl.EnableCustomFiltering = true;
this.radMultiColumnComboBox1.EditorControl.CustomFiltering += EditorControl_CustomFiltering;

 private void EditorControl_CustomFiltering(object sender, GridViewCustomFilteringEventArgs e)
 {
     string searchText = this.radMultiColumnComboBox1.MultiColumnComboBoxElement.EditorElement.Text;
     if (searchText != string.Empty)
     {
         Instrument instrument = e.Row.DataBoundItem as Instrument;

         e.Handled = true;
         e.Visible = instrument.Isin.Contains(searchText) || instrument.Description.Contains(searchText) || instrument.AlphaCode.Contains(searchText) ||
                     instrument.MicMarketplaceCode.Contains(searchText) || instrument.WorpMarketPlaceDescription.Contains(searchText) ||
                     instrument.InstrumentType.Contains(searchText) || instrument.DerivateIsin.Contains(searchText);
     }
 }
Completed
Last Updated: 12 Dec 2015 13:31 by ADMIN
To reproduce:
- Set the AutoFileter property to true.
- Add filter descriptor;
- Start the application and type something in the control - you just need to filter the values so more than one entry is available in the drop down.
- Press Tab or click on other control.
- You will notice that the selected value is set, but the text is not synchronized.

Workaround:
void radMultiColumnComboBox1_Validated(object sender, EventArgs e)
{
    if (radMultiColumnComboBox1.SelectedValue != null)
    {
        string text = radMultiColumnComboBox1.EditorControl.CurrentRow.Cells[radMultiColumnComboBox1.DisplayMember].Value.ToString();
        if (text != radMultiColumnComboBox1.Text)
        {
            radMultiColumnComboBox1.Text = text;
        }
    }
}
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