Hi everyone,
You can use the below override of the dispose() method of the RadNavigation to solve the issue:
<script>
Telerik.Web.UI.RadNavigation.prototype.dispose = function () {
this._collapseSandwich();
var element = $telerik.$(this._sandwichAnimationcontainer);
element.parent().remove();
// Specify the ID of the button element
$find('grid1_ctl00_ctl02_ctl00_ctl00_RadButton1').dispose();
this._detachEvents();
Telerik.Web.UI.RadNavigation.callBaseMethod(this, 'dispose');
}
</script>