title: Mouse movement capture
body: <p>I have an application wich open a modal form with the ShowDialog method.
  Once this form is displayed I want to capture the mouse movement even if the cursor is outside the form.
  How can I capture the mouse movement? I saw something with the Capture property but I cannot manage to make it work.</p>
  
  <p>[edit]</p>
  
  <p>I want to be notified if the mouse move outside the form.</p>