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You can subscribe to the MouseDown
event and show the custom context menu. Please refer to the following code snippet:
sender, MouseEventArgs e)
(e.Button == System.Windows.Forms.MouseButtons.Right)
More information how to customize the default context menu of the RadGridView
can be found in the article GridView >> Context Menus
I have also attached a sample project which demonstrates the implementation.
Should you have further questions, I would be glad to help.