title: OnClientClick event handler not called if using onclick
body: <p>I have a gridview with templatefield. I put a Linkbutton in templatefield.
  I want show popup window and update db when linkbutton is click .
  I use the following code</p>
  
  <pre><code>&lt;asp:LinkButton onclick="LinkButton-click" onclientclick="javascript:SP.UI.ModalDialog.ShowModalDialog({url:''}; return true;)." runnat="serevr" /&gt;
  </code></pre>
  
  <p>but popup Window opens and is closed after a few moments</p>