Vista - WPF flicker in ElementHost

Hello,

I am hosting Wpf elements inside a WinForms form, using interop
through the ElementHost class. When I resize the Wpf element using a
Wpf Thumb control, I am getting a noticable flicker. During the drag
of the Wpf Thumb control, I resize the transparant parent WinForm and
this correctly resizes other Wpf elements docked to it.

There are no visible WinForm items only Wpf that need to be displayed
and I suspect that Wpf and Dx are rendering along with GDI+ for the
ElementHost whose child is the Wpf UserControl that contains the
displayable content? And this causes the horrible flicker.

Is it possible to disable rendering at the ElementHost level, so that
only Wpf renders? Or is it possible to sync the rendering of a frame
in Dx when the content is ready to display. (similar to a double
buffering technique that I know Dx does)

Any help is greatly appreciated.

Victor Grippi