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gridDataBoundGrid1.EndUpdate();
gridDataBoundGrid1.Focus();
gridDataBoundGrid1.Refresh();
Or you could try this,
gridDataBoundGrid1.EndUpdate();
gridDataBoundGrid1.CurrentCell.MoveTo(-1, -1);
gridDataBoundGrid1.Focus();
gridDataBoundGrid1.Refresh();
There are style properties like style.Enabled and style.Clickable that might make a cell not be clickable, so you should check if you have set any of these proeprties.