   C++ Win - Toolbar tooltips not refreshed
  Hello,My application displays tooltips for my toolbar created with TBstyle_TOOLTIPS style.The tooltip text is set in the TBN_GETINFOTIP notification.It works fine when my application runs normally fast. But for some reason, it sometimes needs a bit more time to get refreshed. In that case, if I change the hot button while the tooltip is showing (the fade effect shows a semi-transparent tooltip), the tooltip shows at the correct place (over the new hot button) but with no content (black or transparent).Also, I got the same result with tooltip style TTS_NOFADE.I added some delays (Sleep(...)) to be able to reproduce it at will, and this behaviour can be observed each time I change the hot button while tooltip is showing ...Any idea why this occurs and what I could do to avoid this ?Thanks,K.   
  It seems to be related to the WS_EX_COMPOSITED style on the windows.If the style is set to the main app window, the tooltip is not correctly redrawn, if it is not set, the tooltip shows normally.I need the WS_EX_COMPOSITED to avoid lot of flickering ...Note: This is with XP, seems to work better in Win7.   