title: Flex datagrid header row right click
body: <p>I got a Datagrid in my Flex application.</p>
  
  <p>I need to make appear a context menu when the header row is right-clicked.
  The latter context menu must not appear when the rest of the datagrid items (the ones containing data) are clicked.</p>
  
  <p>Edit: the application runs in AIR environment, so i got no flash-player troubles</p>