title: CombineRgn not working
body: <p>I have two region say <code>rgn1</code> and <code>rgn2</code>. I wanted to combine both of them using CombineRgn function. So I write -  </p>
  
  <pre><code>if CombineRgn(rgnMain,rgn1,rgn2,RGN_OR) = error then
           ShowMessage('error'); 
  </code></pre>
  
  <p>Its giving return value as ERROR.  </p>
  
  <p>I have tested that rgn1 and rgn2 are correct region.<br>
  Thank You. </p>