title: telerik window does not show
body: <p>On page I write telerik window:</p>
  
  <pre><code>&lt;telerik:RadWindow ID="DictionaryWindow" runat="server"&gt;&lt;/telerik:RadWindow&gt;
  </code></pre>
  
  <p>on this page I run javascript when user click on button:</p>
  
  <pre><code>&lt;script type="text/javascript"&gt;
  function getWindow() { return document.getElementById("&lt;%= DictionaryWindow.ClientID %&gt;"); }
  
  var oWin = getWindow();
      if (oWin != null) {            
          oWin.setUrl("WebForm1.aspx");
          oWin.set_width(800);
          oWin.set_height(800);
          oWin.Show();
          oWin.Center();
  
      }
  &lt;/script&gt;
  </code></pre>
  
  <p>an error apears: Object doesn't support this property or method.
  I find this javascript on the net like example. 
  Is this the correct way to get telerik window to show? Can I get the window to appear some another way?</p>