cambalinho 125 Practically a Posting Shark

i'm learning, by work, how use win32 forms applications. but i'm geting a problem: the label(STATIC class) is give me flickers :(
i had tryied use the WS_EX_COMPOSITED but give me problems with WM_MOUSEMOVE message :(
someone tell me something about double-buffering, but i only knows use it for images and not controls :(
please can anyone explain to me something? please?