Hi, I know this is an old post, but I am trying to accomplish the same in my GridView w/o success. Mine is a vb.net winforms app.
I tried both the FilterPopupInitialized event:
Private Sub RadGridView1_FilterPopupInitialized(sender As Object, e As FilterPopupInitializedEventArgs) Handles RadGridView1.FilterPopupInitialized
DirectCast(e.FilterPopup, BaseFilterPopup).MinimumSize = New System.Drawing.Size(400, 400)
And the FilterPopupRequired event:
Private Sub RadGridView1_FilterPopupRequired(sender As Object, e As FilterPopupRequiredEventArgs) Handles RadGridView1.FilterPopupRequired
Neither event fires, I added breakpoints and never hit them.
I'm probably missing something simple, I would be grateful for any help.