I modified the following online example:
which illustrates how to add custom columns. Here are the changes which I made:
1) In the RadFileExplorer1.Grid.ItemDataBound server-side event handler - the "Owners" column goes hidden by adding display:none to it. Using this approach- the column will exists on the client, but it will not be visible
2) The RadFileExplorer1.GridContextMenu.OnClientShowing client-side event is handled and an alert displays the corresponding value of the "Owner" column. The code is invoked when you try to open the ContextMenu.
Please find the attached example.
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