title: How to deal with GetDataPresent to let it accept all the derived types
body: <p>I'm using <a href="http://msdn.microsoft.com/en-us/library/197y17b6.aspx" rel="noreferrer">drgevent.Data.GetDataPresent</a> to determine whether the dragged component is acceptable or not.</p>
  
  <p>I've got a problem which is that I want to accept a specific type say SomeType and all the types that derived from it. Seems <code>GetDataPresent</code> doesn't support such requirement.</p>
  
  <p>Any idea?</p>