Hi Vijay,

I guess you ask about client side action, because on server it is easy to do. The ContentPane has a findControl(partial_ID) member function, which allows you to get reference to html element which id is based on partial_ID. To get reference to child control which is based on javascript, like WebNumericEdit, you should use functionality of that particular control like igedit_getById(clientIdOfControl).

Below is example to set url on button click

<script type="text/javascript">
function loadUrl()
{
 var splitter = $find('WebSplitter1');
 var textBox1 = splitter.get_panes()[0].findChild('TextBox1');
 if(!textBox1)
  return;
 splitter.get_panes()[1].set_contentUrl(textBox1.value);
}
</script>

<ig:WebSplitter ID="WebSplitter1" runat="server" Height="133px" Width="321px">
 <Panes>
  <ig:SplitterPane runat="server">
    <Template>
      <asp:TextBox ID="TextBox1" runat="server" Text="http://www.apple.com"></asp:TextBox>
      <input type="button" value="Load" onclick="loadUrl()" />
    </Template>
  </ig:SplitterPane>
  <ig:SplitterPane runat="server" ContentUrl="http://www.mozilla.com">
  </ig:SplitterPane>
 </Panes>
</ig:WebSplitter>