fDrawBuffer
BBitmap* fDrawBuffer;
return fDrawBuffer->Lock();
fDrawBuffer->Unlock();
return fDrawBuffer;
fDrawBuffer = new BBitmap(Bounds(), B_RGB32, true);
fDrawBuffer->Lock();
fDrawBuffer->AddChild(this);
fDrawBuffer->Unlock();
if (fDrawBuffer) {
fDrawBuffer->Lock();
fDrawBuffer->RemoveChild(this);
fDrawBuffer->Unlock();
delete fDrawBuffer;
fDrawBuffer = NULL;