The AfterUpdate event of this flag is what you want to use.
If you cannot start it, try adding this as well:
Private Sub YourGridcontrol_MouseDown(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles YourGridcontrol.MouseDown YourGridcontrol.PerformAction(Infragistics.Win.UltraWinGrid.UltraGridAction.EnterEditMode) End Sub Private Sub YourGridcontrol_MouseUp(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles YourGridcontrol.MouseUp YourGridcontrol.PerformAction(Infragistics.Win.UltraWinGrid.UltraGridAction.ExitEditMode) End Sub
By default, just toggling this checkbox does not seem to trigger an update. Entering / exiting edit mode, AfterUpdate should work the way you want.
UPDATE: Or, as Vincent suggested, performing PerformAction on a CellChange event should also work. The essence is the same.
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