This was exactly my problem, when u click the left button hold it move the mouse away from the button the tooltip wont receive the WM_MOUSEMOVE message. The way i worked around it was in the LeftButtonUp handler i just sent a notification to my tooltip ( if i had one ) that the mouse has moved:
Code:UINT lParam=0; lParam|=point.y<<16; lParam|=(WORD)point.x; m_ToolTip.SendMessage(WM_MOUSEMOVE,0,lParam);




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