c# - Transparent control flickering on scrolling -

i've created application in c# has custom buttons. these have transparent background therefore enherited control , override createparams/onpaintbackground , added invalidateex function.

now need grid layout(tablelayoutpanel) transparent. again created own control , override createparams/onpaintbackground , added invalidateex function. on scroll see backgrounds 'remembers' has drawn , therefore see ghosting (if thats correct word). hooking invalidateex function scroll event make panel flicker on scrolling.

is there way remove flicker?

public class gridlayout : tablelayoutpanel {     public gridlayout()     {         this.scroll += delegate { this.invalidateex(); };     }      protected override createparams createparams     {                 {             createparams cp = base.createparams;             cp.exstyle |= 0x20; //transparent             return cp;         }     }      protected override void onpaintbackground(painteventargs e)     {         // nothing     }      protected void invalidateex()     {         if (parent == null)             return;          rectangle rc = new rectangle(this.location, this.size);         parent.invalidate(rc, true);     } } 

i thought of using wpf haven't got experience in , need create in couple of days -> winforms.