Currently, the event arguments do not expose the data item.

ArgumentNullExceptionn in the RadPropertyValuesCollection class.

The issue can be reproduced by setting the AssociatedControl property in the designer and later at run-time.

Use attached to reproduce. Broken in version 2018.3.1016.40

Workaround:
private Size minSizeState;
private Size maxSizeState;
protected override void HandleDpiChanged()
{
    //base.HandleDpiChanged();

    float scaleFactor = 1f;

    if (this.oldDpi != 0)
    {
        scaleFactor = (float)this.currentDpi / this.oldDpi;
    }
    else if (this.oldDpi == 0) //Form shown for the first time.
    {
        scaleFactor = (float)this.currentDpi / 96f;
    }

    if (scaleFactor == 1f)
    {
        return;
    }

    this.maxSizeState = this.MaximumSize;
    this.minSizeState = this.MinimumSize;
    this.MinimumSize = Size.Empty;
    this.MaximumSize = Size.Empty;
    
    this.Scale(new SizeF(scaleFactor, scaleFactor));
   
    this.MinimumSize = TelerikDpiHelper.ScaleSize(this.minSizeState, new SizeF(scaleFactor, scaleFactor));
    this.MaximumSize = TelerikDpiHelper.ScaleSize(this.maxSizeState, new SizeF(scaleFactor, scaleFactor));

}

When RadRichTextBox.IsReasdOnly is true, RadRichTextBox.CommandExecuting is not raised when the user double clicks the header or footer area.

 The scroll in the SuggestedActionsElement cannot be made visible, one can scroll only with the mouse. Introduce a property so there is an indication that additional items are available.

In addition, the CreateChatElement in RadChat class should be made virtual. 

How to reproduce: 

this.radDiagram1.RoutingService.Router = new Telerik.Windows.Diagrams.Core.OrgTreeRouter() { TreeLayoutType = Telerik.Windows.Diagrams.Core.TreeLayoutType.TipOverTree };

this.radDiagram1.RouteConnections = true;

When there are no data rows in the grid the new row is current and the message is not displayed. In some themes, the grid looks like there is a single row which is confusing to the end users. 

Workaround: 

How to reproduce:

LineSeries lineSeries = new LineSeries();
lineSeries.DataPoints.Add(new CategoricalDataPoint(6, "Harley"));
lineSeries.DataPoints.Add(new CategoricalDataPoint(4, "White"));
lineSeries.DataPoints.Add(new CategoricalDataPoint(7, "Smith"));
lineSeries.DataPoints.Add(new CategoricalDataPoint(5, "Jones"));
lineSeries.DataPoints.Add(new CategoricalDataPoint(3, "Marshall"));
lineSeries.DataPoints.Add(new CategoricalDataPoint(8, "Stevens"));
lineSeries.DataPoints.Add(new CategoricalDataPoint(7, "Brown"));
lineSeries.DataPoints.Add(new CategoricalDataPoint(10, "Carter"));
lineSeries.DataPoints.Add(new CategoricalDataPoint(4, "Bryant"));
lineSeries.DataPoints.Add(new CategoricalDataPoint(5, "Mora"));
lineSeries.DataPoints.Add(new CategoricalDataPoint(2, "Roy"));

CategoricalAxis continuousAxis = new CategoricalAxis();
continuousAxis.PlotMode = AxisPlotMode.OnTicks;
continuousAxis.LabelFormat = "{0:d}";
continuousAxis.ScaleBreakStyle = ScaleBreakStyle.Ragged;
lineSeries.HorizontalAxis = continuousAxis;
this.radChartView1.Series.Add(lineSeries);

//setup plot band
CartesianPlotBandAnnotation annotation1 = new CartesianPlotBandAnnotation();
annotation1.Axis = this.radChartView1.Axes[0] as CartesianAxis;
annotation1.From = "Bryant";
annotation1.To = "Mora";
annotation1.BackColor = Color.FromArgb(100, Color.LightBlue);
annotation1.BorderColor = Color.Black;
annotation1.BorderWidth = 1;
this.radChartView1.Annotations.Add(annotation1);

AxisScaleBreak scaleBreakItem = new AxisScaleBreak();
scaleBreakItem.Name = "Item1";
scaleBreakItem.From = "Smith";
scaleBreakItem.To = "Brown";

horizontalAxis.ScaleBreakSize = 50;
horizontalAxis.ScaleBreaks.Add(scaleBreakItem);

LineSeries lineSeries = new LineSeries();
lineSeries.DataPoints.Add(new CategoricalDataPoint(6, DateTime.Now));
lineSeries.DataPoints.Add(new CategoricalDataPoint(4, DateTime.Now.AddDays(1)));
lineSeries.DataPoints.Add(new CategoricalDataPoint(7, DateTime.Now.AddDays(2)));
lineSeries.DataPoints.Add(new CategoricalDataPoint(5, DateTime.Now.AddDays(3)));
lineSeries.DataPoints.Add(new CategoricalDataPoint(3, DateTime.Now.AddDays(4)));
lineSeries.DataPoints.Add(new CategoricalDataPoint(8, DateTime.Now.AddDays(5)));
lineSeries.DataPoints.Add(new CategoricalDataPoint(7, DateTime.Now.AddDays(6)));
lineSeries.DataPoints.Add(new CategoricalDataPoint(10, DateTime.Now.AddDays(7)));
lineSeries.DataPoints.Add(new CategoricalDataPoint(4, DateTime.Now.AddDays(8)));
lineSeries.DataPoints.Add(new CategoricalDataPoint(5, DateTime.Now.AddDays(9)));
lineSeries.DataPoints.Add(new CategoricalDataPoint(2, DateTime.Now.AddDays(10)));

DateTimeContinuousAxis continuousAxis = new DateTimeContinuousAxis();
continuousAxis.PlotMode = AxisPlotMode.OnTicks;
continuousAxis.LabelFormat = "{0:d}";
continuousAxis.ScaleBreakStyle = ScaleBreakStyle.Ragged;
lineSeries.HorizontalAxis = continuousAxis;
this.radChartView1.Series.Add(lineSeries);

DateTimeContinuousAxis horizontalAxis = radChartView1.Axes.Get<DateTimeContinuousAxis>(0);

AxisScaleBreak scaleBreakItem = new AxisScaleBreak();
scaleBreakItem.Name = "Item1";
scaleBreakItem.From = DateTime.Now.AddDays(3);
scaleBreakItem.To = DateTime.Now.AddDays(6);

Currently, the DashStyle cannot be changed.

The desired location of the command bar strip elements is saved with a scaled location.

To reproduce:

 radMaskedEditBox1.MaskedEditBoxElement.ContextMenuEnabled = true;

Workaround:

public RadForm1()
{
    InitializeComponent();
    radMaskedEditBox1.MaskType = Telerik.WinControls.UI.MaskType.Standard;
    radMaskedEditBox1.Mask = "9999999999";
    radMaskedEditBox1.MaskedEditBoxElement.ContextMenuEnabled = true;
    radMaskedEditBox1.MaskedEditBoxElement.ContextMenu = BuildContextMenu();
}
private RadContextMenu BuildContextMenu()
{
    var contextMenu = new RadContextMenu();


    if (contextMenu == null)
    {
        contextMenu = new RadContextMenu();
    }

    if (contextMenu.Items.Count == 0)
    {
        RadMenuItem menuItem = new Telerik.WinControls.UI.RadMenuItem("Cut");
        menuItem.Name = "Cut";
        contextMenu.Items.Add(menuItem);
        menuItem.Click += new System.EventHandler(this.ContextMenuMenuItem_Click);

        menuItem = new Telerik.WinControls.UI.RadMenuItem("Test");
        menuItem.Name = "Copy";
        contextMenu.Items.Add(menuItem);
        menuItem.Click += new System.EventHandler(this.ContextMenuMenuItem_Click);

        menuItem = new Telerik.WinControls.UI.RadMenuItem("Paste");
        menuItem.Name = "Paste";
        contextMenu.Items.Add(menuItem);
        menuItem.Click += new System.EventHandler(this.ContextMenuMenuItem_Click);

        menuItem = new Telerik.WinControls.UI.RadMenuItem("Delete");
        menuItem.Name = "Delete";
        contextMenu.Items.Add(menuItem);
        menuItem.Click += new System.EventHandler(this.ContextMenuMenuItem_Click);

        menuItem = new Telerik.WinControls.UI.RadMenuItem("Select All");
        menuItem.Name = "Select All";
        contextMenu.Items.Add(menuItem);
        menuItem.Click += new System.EventHandler(this.ContextMenuMenuItem_Click);
    }
    return contextMenu;
}
void ContextMenuMenuItem_Click(object sender, EventArgs e)
{
    switch (((Telerik.WinControls.UI.RadMenuItem)(sender)).Name.ToUpper())
    {
        case "UNDO":
            //this.radMaskedEditBox1.MaskedEditBoxElement.TextBoxItem.;
            break;
        case "CUT":
            this.radMaskedEditBox1.MaskedEditBoxElement.TextBoxItem.Cut();
            break;
        case "COPY":
            this.radMaskedEditBox1.MaskedEditBoxElement.TextBoxItem.Copy();
            break;
        case "PASTE":
            this.radMaskedEditBox1.MaskedEditBoxElement.TextBoxItem.Paste();
            if (!this.radMaskedEditBox1.MaskedEditBoxElement.Provider.Validate(this.Text))
            {
                this.radMaskedEditBox1.MaskedEditBoxElement.TextBoxItem.TextBoxControl.Undo();
            }

            break;
        case "DELETE":
            this.radMaskedEditBox1.MaskedEditBoxElement.TextBoxItem.Clear();
            break;
        case "SELECT ALL":
            this.radMaskedEditBox1.MaskedEditBoxElement.TextBoxItem.SelectAll();
            break;
        default:
            break;
    }
}

See attached to reproduce.

Workaround:
class MyImageEditor : RadImageEditor
{
    protected override RadImageEditorElement CreateImageEditorElement()
    {
        return new MyImageEditorElement();
    }
}
class MyImageEditorElement : RadImageEditorElement
{
    protected override ImageEditorCanvasElement CreateCanvasElement()
    {
        return new MyCanvasElement(this);
    }
}

class MyCanvasElement : ImageEditorCanvasElement
{
    public MyCanvasElement(RadImageEditorElement owner) : base(owner)
    {

    }
    protected override void PaintElement(IGraphics graphics, float angle, SizeF scale)
    {
        base.PaintElement(graphics, angle, scale);

        if (this.IsCropping)
        {
            Rectangle dynamicCropRect = GetCropRectangle();
            SizeF scaleDown = new SizeF(1f / this.DpiScaleFactor.Width, 1f / this.DpiScaleFactor.Height);

            this.AcceptButton.PositionOffset = TelerikDpiHelper.ScaleSizeF(new SizeF((dynamicCropRect.X + dynamicCropRect.Width / 2f) - this.AcceptButton.Location.X - this.AcceptButton.DesiredSize.Width,
                dynamicCropRect.Y + dynamicCropRect.Height - (this.AcceptButton.DesiredSize.Height + 10)), scaleDown);
            this.CancelButton.PositionOffset = TelerikDpiHelper.ScaleSizeF(new SizeF((dynamicCropRect.X + dynamicCropRect.Width / 2f) - this.CancelButton.Location.X - this.CancelButton.DesiredSize.Width,
                (dynamicCropRect.Y + dynamicCropRect.Height - (this.CancelButton.DesiredSize.Height + 10)) - this.CancelButton.Location.Y), scaleDown);
        }

    }
}

How to reproduce: add a MapCallout to a layer and then try to hit test it in the MouseDown event of the control. The element is not always returned even though it contains the mouse location:

private void RadMap1_MouseDown(object sender, MouseEventArgs e)
{
    PointL point = new PointL(e.X - this.radMap1.MapElement.PanOffset.Width, e.Y - this.radMap1.MapElement.PanOffset.Height);
    MapCallout callout2 = this.radMap1.Layers.HitTest(point) as MapCallout;
    if (callout2 != null)
    {
        RadMessageBox.Show("MapCallout!");
    }
}

Use attached to reproduce:

1. Click the button

2. Change the tab and go back to the diagram

Workaround:

Add the layout before showing the form

How to reproduce: 

1. Add a new RadTabbedForm to a VS2017 VB.NET project. 

2. Select the new form in the design view window

3. In the properties box, got to "Tabs" and click the ellipsis (…)

4. The collection editor opens.

5. Click the first tab in the list and change the "Text" property to something new

6. Click "OK"  to save changes

When one performs a pan operation the axis minimum and maximum should be automatically adjusted. See https://www.okex.com/market?product=btt_usdt

An exception is thrown inside TableSearchRow_SearchProgressChanged event. GridSearchResultCellCollection Cells value is null.

Please note that issue firstly occurs in version 2018.3.116.

The issue can be reproduced in a tree with 30 000 parent nodes each having one child.