title: Mouse Enter & Mouse Leave on a form
body: <p>I have a form with child controls.
  I want when user move mouse over the form, the form will be closed.
  So I catch mouse enter and move leave on the form. But if I move mouse on any controls in form, mouse leave event will be also caught.</p>
  
  <p>Please help me to solve this problem. Thanks.</p>
  
  <p><strong>UPDATE:</strong>
  When the cursor's position is on the form's caption region (this region is called non-client region). I move mouse out of this region, I can't receive the WM_MOUSELEAVE message as well as WM_NCMOUSELEAVE. Please help me in this problem. I want to receive a message when move mouse out of this region. Thanks.</p>