Flickering when using transparent editor

When a richedit is set to transparent the display flickers horribly when scrolling. Are there any settings that can eliminate the flicker?

FYI: I am trying to use WPT with the devexpress vcl controls and I wanted the desktop to have the devex skin effect. (panels have an image painted on them.)

The flickering is probably caused because of the interaction between different controls. But some flickering is expected since transparency disables the doublebuffer.

If you want an image in the background use the event PaintDesktopBackground to paint it.