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Some things you can try. If you are seeing a gripper in the lower right, you can try
this.gridDataBoundGrid1.SizeGripStyle = SizeGripStyle.Hide;
Another property to check is
this.gridDataBoundGrid1.SmartSizeBox = false;
If all else fails, you can derive the grid and override OnPaint. In your override, you can call the baseclass to do the standard paint, then you can draw on the window to cover up whatever rectangle you want using e.Graphics.FillRectangle.