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RadDiagram gives you the ability to resize shapes by dragging their Resizing Thumbs. You can also use the shapes' Width and Height for this purpose.

Enable/Disable resizing

By default, the RadDiagram is enabled for resizing manipulation. In order to disable this functionality, you can set the IsResizingEnabled property to false.

WinForms RadDiagram Enable/Disable Resizing

this.radDiagram1.IsResizingEnabled = false;

Me.RadDiagram1.IsResizingEnabled = False

Manipulation adorner

The IsManipulationAdornerVisible property controls whether the manipulation adorner will be displayed or not.

Width and Height

You can resize shapes by using their Width and Height properties:

WinForms RadDiagram Width and Height

RadDiagramShape resizedShape = new RadDiagramShape()
    Text = "",
    ElementShape = new RoundRectShape(5),
    BackColor = System.Drawing.Color.LightBlue
resizedShape.Width = 300;
resizedShape.Height = 100;
resizedShape.Position = new Telerik.Windows.Diagrams.Core.Point(10, 10);

Dim resizedShape As New RadDiagramShape() With { _
    .Text = "", _
    .ElementShape = New RoundRectShape(5), _
    .BackColor = System.Drawing.Color.LightBlue _
resizedShape.Width = 300
resizedShape.Height = 100
resizedShape.Position = New Telerik.Windows.Diagrams.Core.Point(10, 10)

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