Cannot get SWebBrowser/WebBrowserWindow to draw

SWebBrowser have an object BrowserWindow, the OnPaint event is never called from BrowserWindow.

I am in UnrealTournament, I know it work on the official release but why that does not work on a custom up-to date build?

bUsesCEF3 = true;

in there in the target.

I really need some help, someone can check/confirm if that work? or do I need to do something special to make it work ?

Thanks in advance!