How to reproduce: 

 public partial class Form1 : Form
 {
     public Form1()
     {
         InitializeComponent();

         RadDiagramShape shape1 = new RadDiagramShape()
         {
             Text = "Second Level Domain",
             ElementShape = new RoundRectShape(4),
             BackColor = Color.LimeGreen
         };
         shape1.Position = new Telerik.Windows.Diagrams.Core.Point(100, 100);
         radDiagram1.Items.Add(shape1);

         var res = radDiagram1.Items[0];
         ((Telerik.WinControls.UI.Diagrams.RadDiagramItem)shape1).EndEdit += item_EndEdit;

         RadDiagramShape shape2 = new RadDiagramShape()
         {
             Text = "Top Level Domain",
             ElementShape = new RoundRectShape(50),
             BackColor = Color.Cyan
         };
         shape2.Position = new Telerik.Windows.Diagrams.Core.Point(1600, 100);

         radDiagram1.Items.Add(shape2);

         RadDiagramShape shape3 = new RadDiagramShape()
         {
             Text = "Organization Domain",
             ElementShape = new RoundRectShape(20),
             BackColor = Color.Yellow
         };
         shape3.Position = new Telerik.Windows.Diagrams.Core.Point(2400, 100);
         radDiagram1.Items.Add(shape3);

         RadDiagramConnection connection1 = new RadDiagramConnection() { Name = "connection1" };
         connection1.Source = shape1;
         connection1.Target = shape2;
         radDiagram1.Items.Add(connection1);

         RadDiagramConnection connection2 = new RadDiagramConnection()
         {
             Name = "connection2"
         };
         connection2.Source = shape2;
         connection2.Target = shape3;
         radDiagram1.Items.Add(connection2);
     }

     private void item_EndEdit(object sender, Telerik.WinControls.UI.Diagrams.RadRoutedEditEventArgs e)
     {
         RadDiagramShape shape = ((RadDiagramShape)sender);
         string txt = shape.Text;
         Size size = TextRenderer.MeasureText(txt, shape.Font, new System.Drawing.Size( (int)shape.Width, int.MaxValue ), ~TextFormatFlags.SingleLine);

         shape.Height = size.Height;
     }

     private void radButton1_Click(object sender, EventArgs e)
     {
         this.radDiagram1.DiagramElement.BringIntoView(radDiagram1.Items[0], this.radDiagram1.Zoom, false);
     }

     private void radButton2_Click(object sender, EventArgs e)
     {
         this.radDiagram1.DiagramElement.BringIntoView(radDiagram1.Items[1], this.radDiagram1.Zoom, false);
     }

     private void radButton3_Click(object sender, EventArgs e)
     {
         this.radDiagram1.DiagramElement.BringIntoView(radDiagram1.Items[2], this.radDiagram1.Zoom, false);
     }
 }

Workaround:  manually update the view
private void radButton1_Click(object sender, EventArgs e)
{
    this.radDiagram1.DiagramElement.BringIntoView(radDiagram1.Items[0], this.radDiagram1.Zoom, false);
    this.radDiagram1.DiagramElement.Controller.OnViewportChanged();
}

private void radButton2_Click(object sender, EventArgs e)
{
    this.radDiagram1.DiagramElement.BringIntoView(radDiagram1.Items[1], this.radDiagram1.Zoom, false);
    this.radDiagram1.DiagramElement.Controller.OnViewportChanged();
}

private void radButton3_Click(object sender, EventArgs e)
{
    this.radDiagram1.DiagramElement.BringIntoView(radDiagram1.Items[2], this.radDiagram1.Zoom, false);
    this.radDiagram1.DiagramElement.Controller.OnViewportChanged();
}

By using these events the user will be able to easily cancel moving of a shape in certain conditions.

Please refer to the attached sample project. If you drag a new shape or copy/paste an existing one it is not added to the DataSource collection as it is added in RadGanttView for example.

Workaround: handle the ItemsChanged event and add a new record to the DataSource manually.

Workaround call the InitializeDiagram method in the OnLoad method of the form.

protected override void OnLoad(EventArgs e)
{
    base.OnLoad(e);
    this.InitializeDiagram();
}

By default, when you bind RadDiagram, RadDiagramShape items are created by the DiagramDataLayer. It would be nice to have the possibility to replace the DiagramDataLayer for example and override its CreateDiagramShapeItem method to use custom RadDiagramShapes.

To reproduce: 
1. Add a RadDiagram to the form and open its property builder at design time. 
2. Add a RadDiagramShape and set some value to the shape's Tag property.
3. Save the changes and exit the property builder.

When you run the application you will notice that the Tag property of the shape is not stored. 

Hello,

I'm contacting to you regarding the RadDiagram in WinForms. Currently I have an issue with the layout by using the AStartRouter (see attached picture). Please find below the code used to setup the router:

this.diagram.RoutingService.Router = new Telerik.Windows.Diagrams.Core.AStarRouter(this.diagram.DiagramElement) 
{ 
AvoidShapes = true,
WallOptimization = true
};
this.diagram.RoutingService.AutoUpdate = true;
this.diagram.RouteConnections = true;

Thanks for your help.

Regards

Please refer to the attached gif file illustrating better the observed behavior when using the UI to add and connect shapes. 

In this scenario, the text on the connection between two shapes is drawn in the wrong location.

 

http://docs.telerik.com/devtools/wpf/controls/raddiagram/extensions/thumbnail

To reproduce: 
1. Add RadDiagram with 10 shapes and connection between them 
2. Set the Layout to be Tree
3. The vertical scrollbar is not layout to the end of diagram, there is a gap. 

Please refer to the attached gif file.

Workaround:  cancel the PreviewPan event and adjust manually the  Telerik.WinControls.UI.Diagrams.Panel.PositionOffset. Here is demonstrated a sample approach:
int widthOffset = -1000;
int heightOffset = -1000;

private void radDiagram_PreviewPan(object sender, Telerik.WinControls.UI.Diagrams.PositionChangedRoutedEventArgs e)
{
    Telerik.WinControls.UI.Diagrams.Panel panel = this.radDiagram.DiagramElement.Children.First() as Telerik.WinControls.UI.Diagrams.Panel;
    Telerik.WinControls.UI.Diagrams.Panel hitTestablePanel = panel.Children.First() as Telerik.WinControls.UI.Diagrams.Panel;

    e.Cancel = true;
    if (panel != null)
    {
        hitTestablePanel.PositionOffset = new SizeF(widthOffset,heightOffset);
        widthOffset += 50;
    }
}

Note: this behavior may be applied to all other relevant manipulation properties

To reproduce:

            this.radDiagram1.IsDraggingEnabled = true;
            RadDiagramShape shape1 = new RadDiagramShape();
            shape1.Text = "Shape1";
            shape1.BackColor = Color.Red;
            shape1.IsDraggingEnabled = false;
            shape1.ElementShape = new RoundRectShape(5);
            this.radDiagram1.Items.Add(shape1);

As a result you will be able to drag the shape which is not correct.

Workaround: set the RadDiagramShape.IsDraggingEnabled  after the shape is added to the diagram:

this.radDiagram1.IsDraggingEnabled = true;
RadDiagramShape shape1 = new RadDiagramShape();
shape1.Text = "Shape1";
shape1.BackColor = Color.Red;         
shape1.ElementShape = new RoundRectShape(5);
this.radDiagram1.Items.Add(shape1);
shape1.IsDraggingEnabled = false;