The cursors used with the different operations in the RadDiagram are stored in a static class called DiagramCursors. In order to change the cursors when you panning, you can just change the value of the DiagramCursors.Panning property before the InitializeComponent() method of your window is called. Here is an example:
DiagramCursors.Panning = Cursors.Cross;
I hope this helps.
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