Set Focus on TextBox in Ajax Modal Popup

Hi Guys,
Use this JS function to set Focus on Modal TextBox

function pageLoad()

{
var popupGroup = $find('ctl00_mdlSelectGroupForEdit'); //ModalPopupExtender Behviour ID
if (popupGroup != null)
popupGroup.add_shown(SetGroupFocus); // It will Fire while u clicking Control to show modal

}

function SetGroupFocus()
{
$get('<%= txtSearchPopupGroupName.ClientID %>').focus();// Set Focus on TextBox.

}
Hope this Solve your Problem,
Thanks,
SuresH