The new functionality should prevent duplicates to be added as tokens in the editor. An already selected item should not be visible in the popup as well. 

The attached 1148813-AutocompleteDuplicates.zip project features a possible custom solution. 

To reproduce:
this.radDateTimePicker1.DateTimePickerElement.TextBoxElement.MaskType = MaskType.FreeFormDateTime;

And try pasting a date, or some free text.

 

https://msdn.microsoft.com/en-us/library/system.windows.forms.maskedtextbox.maskcompleted(v=vs.110).aspx

1. Provide the 'Ignore' button above the 'Ignore All' button 

2. If no text is entered in the 'Change To' text field and the 'Change' button is clicked, the highlighted suggestion should be used instead.

3. After the 'Change' button is clicked, the 'Change To' text box should be cleared so that users don't have to delete the text string before entering something else.

Workaround: use simple data binding with the editor and its Text property

this.radCalculatorDropDown1.CalculatorElement.EditorContentElement.TextBoxItem.DataBindings.Add("Text", testObject, "TestValue", false, DataSourceUpdateMode.OnPropertyChanged);

Description: When binding to a null value, the RadSpinEditor throws an exception. This missing functionality is also noticed with the standard Windows Numeric Up Down control.

How to reproduce:
- add a RadSpinEditor and two RadButtons;
- use the following code:

public partial class Form1 : Form
{
    private BindingSource _bindActiveObject = new BindingSource { DataSource = typeof(MyBindingObject) };

    public Form1()
    {
        InitializeComponent();

        this.radSpinEditor1.DataBindings.Add(new Binding("Value", _bindActiveObject, "MyValue"));
    }

    private void radButton1_Click(object sender, EventArgs e)
    {
        _bindActiveObject.DataSource = new MyBindingObject { MyValue = Convert.ToDouble(100) };
    }

    private void radButton2_Click(object sender, EventArgs e)
    {
        _bindActiveObject.DataSource = new MyBindingObject { MyValue = null };
    }
}

public class MyBindingObject
{
    private decimal? _myValue;

    public decimal? MyValue
    {
        get
        {
            return _myValue;
        }
        set
        {
            _myValue = value;
        }
    }
}

Workaround:

Use the following custom RadSpinEditor:

private BindingSource _bindActiveObject = new BindingSource { DataSource = typeof(MyBindingObject) };

public Form1()
{
    InitializeComponent();
    this.radSpinEditor1.NullableValueChanged += Form1_NullableValueChanged;
    this.radSpinEditor1.DecimalPlaces = 2;
    this.radSpinEditor1.DataBindings.Add(new Binding("NullableValue", _bindActiveObject,
        "MyValue", true, DataSourceUpdateMode.OnPropertyChanged));
}

private void Form1_NullableValueChanged(object sender, EventArgs e)
{
    Console.WriteLine("NullableValue = " + this.radSpinEditor1.NullableValue + "");
}

private void radButton1_Click(object sender, EventArgs e)
{
    MyBindingObject obj = new MyBindingObject { MyValue = 65.45m };
    _bindActiveObject.DataSource = obj; 
}

private void radButton2_Click(object sender, EventArgs e)
{
    _bindActiveObject.DataSource = new MyBindingObject { MyValue = null };
}

public class MyBindingObject
{
    private decimal? _myValue;

    public decimal? MyValue
    {
        get
        {
            return _myValue;
        }
        set
        {
            _myValue = value;
        }
    }
}

public class MySpinEditor : RadSpinEditor
{
    public event EventHandler NullableValueChanged;

    public decimal? NullableValue
    {
        get
        {
            return (this.SpinElement as MySpinEditorElement).NullableValue;
        }
        set
        {
            (this.SpinElement as MySpinEditorElement).NullableValue = value;
        }
    }

    public MySpinEditor()
    {
        this.AutoSize = true;
        this.TabStop = false;
        base.SetStyle(ControlStyles.Selectable, true);
    }

    protected override void CreateChildItems(RadElement parent)
    {
        Type baseType = typeof(RadSpinEditor);
        MySpinEditorElement element = new MySpinEditorElement();
        element.RightToLeft = this.RightToLeft == System.Windows.Forms.RightToLeft.Yes;
        this.RootElement.Children.Add(element);

        element.ValueChanging += spinElement_ValueChanging;
        element.ValueChanged += spinElement_ValueChanged;
        element.TextChanging += spinElement_TextChanging;
        element.NullableValueChanged += element_NullableValueChanged;

        element.KeyDown += OnSpinElementKeyDown;
        element.KeyPress += OnSpinElementKeyPress;
        element.KeyUp += OnSpinElementKeyUp;

        baseType.GetField("spinElement", BindingFlags.Instance | BindingFlags.NonPublic).SetValue(this, element);
    }

    void element_NullableValueChanged(object sender, EventArgs e)
    {
        if (this.NullableValueChanged != null)
        {
            this.NullableValueChanged(this, EventArgs.Empty);
        }
    }

    private Dictionary<string, MethodInfo> cache = new Dictionary<string, MethodInfo>();

    private void InvokeBaseMethod(string name, params object[] parameters)
    {
        if (!cache.ContainsKey(name))
        {
            cache[name] = typeof(RadSpinEditor).GetMethod(name, BindingFlags.Instance | BindingFlags.NonPublic);
        }

        cache[name].Invoke(this, parameters);
    }

    private void OnSpinElementKeyUp(object sender, KeyEventArgs e)
    {
        this.InvokeBaseMethod("OnSpinElementKeyUp", sender, e);
    }

    private void OnSpinElementKeyPress(object sender, KeyPressEventArgs e)
    {
        this.InvokeBaseMethod("OnSpinElementKeyPress", sender, e);
    }

    private void OnSpinElementKeyDown(object sender, KeyEventArgs e)
    {
        this.InvokeBaseMethod("OnSpinElementKeyDown", sender, e);
    }

    private void spinElement_TextChanging(object sender, TextChangingEventArgs e)
    {
        this.InvokeBaseMethod("spinElement_TextChanging", sender, e);
    }

    private void spinElement_ValueChanged(object sender, EventArgs e)
    {
        this.InvokeBaseMethod("spinElement_ValueChanged", sender, e);
        this.NullableValue = this.Value;
    }

    private void spinElement_ValueChanging(object sender, ValueChangingEventArgs e)
    {
        this.InvokeBaseMethod("spinElement_ValueChanging", sender, e);
    }

    protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
    {
        if (keyData == Keys.Tab)
        {
            (this.SpinElement as MySpinEditorElement).CommitText();
        }
       else if (keyData== Keys.Delete)
       {
           (this.SpinElement as MySpinEditorElement).NullableValue = null;
        } 
        return base.ProcessCmdKey(ref msg, keyData);
    }

    protected override Size DefaultSize
    {
        get
        {
            return GetDpiScaledSize(new Size(100, 20));
        }
    }
}

public class MySpinEditorElement : RadSpinElement
{
    private bool validating;
    private decimal? nullableValue;
    private RadButtonElement nullButton;

    public decimal? NullableValue
    {
        get
        {
            return this.nullableValue;
        }
        set
        {
            this.nullableValue = value;
            if (value.HasValue)
            {
                this.internalValue = value.Value;
            }
            else
            {
                this.internalValue = 0m;
            }

            this.Validate();
            this.OnNullableValueChanged();
        }
    }

    protected override void OnKeyDown(KeyEventArgs e)
    {
        if (e.KeyCode == Keys.Enter)
        {
            this.CommitText();
            e.Handled = true;
            return;
        }

        base.OnKeyDown(e);
    }

    void nullButton_Click(object sender, EventArgs e)
    {
        this.NullableValue = null;
    }

    public virtual void CommitText()
    {
        this.NullableValue = this.GetValueFromText();
    }

    protected override decimal GetValueFromText()
    {
        if (this.TextBoxItem.Text == "")
        {
            return 0m;
        }

        return base.GetValueFromText();
    }

    public override bool Validate()
    {
        if (!this.NullableValue.HasValue)
        {
            this.TextBoxItem.Text = "";
            return true;
        }

        this.TextBoxItem.Text = this.GetTextFromNumber(this.NullableValue.HasValue ? this.internalValue : 0m, this.Hexadecimal,
            this.ThousandsSeparator, this.DecimalPlaces);

        return true;
    }

    private string GetTextFromNumber(decimal num, bool hex, bool thousands, int decimalPlaces)
    {
        if (hex)
        {
            return string.Format("{0:X}", (long)num);
        }

        return num.ToString((thousands ? "N" : "F") + decimalPlaces.ToString(CultureInfo.CurrentCulture), CultureInfo.CurrentCulture);
    }

    public override void PerformStep(decimal step)
    {
        decimal value = this.GetValueFromText();

        try
        {
            decimal incValue = value + step;
            value = incValue;
        }
        catch (OverflowException)
        {
        }

        this.NullableValue = this.Constrain(value);
        this.Validate();
    }

    protected override Type ThemeEffectiveType
    {
        get
        {
            return typeof(RadSpinElement);
        }
    }

    public event EventHandler NullableValueChanged;

    protected virtual void OnNullableValueChanged()
    {
        if (this.NullableValueChanged != null)
        {
            this.NullableValueChanged(this, EventArgs.Empty);
        }
    }
}

ADD. Popup control which can host controls and be associated with a button or opened on request.

One should be able to disable the saving of the custom colors. In addition one should be able to override the color dialog FormClosing method.

Add IME support to RadTextBoxControl and RadAutoCompleteBox.

When the IP is set like this:
this.radMaskedEditBox1.Value = "89.111.222.123";
the value in the box is not correct:
891.112.221.23

In addition the user should be able to insert digits not just replace them. 

When the user is typing before already typed text, the text is overridden. Add the ability to insert characters instead of replacing them like in the .Net MaskedTextBox.