Hi Bandar,
Regret for the inconvenience caused.
Here is the modified code in VB.Net. Call the EnableDoubleBufferSurface() subroutine to avoid the misbehavior of blink while using RTL.
Me.gridGroupingControl1.TableControl.EnableDoubleBufferSurface()
Here is a sample for your reference(VB.Net)
http://www.syncfusion.com/uploads/redirect.aspx?&team=support&file=VB-622653177.zipLet us know if you have any further concerns
Regards,
Arulraj.A