function disposeTree(sender, args) {
        var elements = args.get_panelsUpdating();
        for (var i = elements.length - 1; i >= 0; i--) {
            var element = elements[i];
            var allnodes = element.getElementsByTagName('*'),
                length = allnodes.length;
            var nodes = new Array(length)
            for (var k = 0; k < length; k++) {
                nodes[k] = allnodes[k];
            }
            for (var j = 0, l = nodes.length; j < l; j++) {
                var node = nodes[j];
                if (node.nodeType === 1) {
                    if (node.dispose && typeof (node.dispose) === "function") {
                        node.dispose();
                    }
                    else if (node.control && typeof (node.control.dispose) === "function") {
                        node.control.dispose();
                    }

                    var behaviors = node._behaviors;
                    if (behaviors) {
                        behaviors = Array.apply(null, behaviors);
                        for (var k = behaviors.length - 1; k >= 0; k--) {
                            behaviors[k].dispose();
                        }
                    }
                }
            }
            element.innerHTML = "";
        }
    }

// run this statement only if ajax is enabled (has scriptmanager)
if (typeof(Sys) !== 'undefined') Sys.WebForms.PageRequestManager.getInstance().add_pageLoading(disposeTree);