thanks for this.
I guessed how to do it before your reply and I originally used the following code to copy the items in my design time context menu across to the default.
It worked fine when I right clicked the main area of the data grid, but if I right clicked the navigation bar, then right clicked the data grid I received an exception "Cannot remove the specified item because it was not found in the specified Collection.".
There's no error if I create the menu items every time so I believe they are disposed of behind the scenes.
sender, Telerik.WinControls.UI.ContextMenuOpeningEventArgs e)
(var idx = 0; idx < radContextMenu1.Items.Count; idx++)