در تصویر پایین دکمه upload میخوام وقتی روش زدم یه صفحه پاپ باز بشه

اینم کد script پیش فرض خودش

(function(global, undefined){
    //A function that will return a reference to the parent radWindow in case the page is loaded in a RadWindow object
    function getRadWindow() {
        var oWindow = null;
        if (window.radWindow) oWindow = window.radWindow;
        else if (window.frameElement.radWindow) oWindow = window.frameElement.radWindow;
        return oWindow;
    }
 
    function OnClientFileOpen(sender, args) {// Called when a file is open.
        var item = args.get_item();
 
        //If file (and not a folder) is selected - call the OnFileSelected method on the parent page
        if (item.get_type() == Telerik.Web.UI.FileExplorerItemType.File) {
            // Cancel the default dialog;
            args.set_cancel(true);
 
            // get reference to the RadWindow
            var wnd = getRadWindow();
 
            //Get a reference to the opener parent page using RadWndow
            var openerPage = wnd.BrowserWindow;
 
            //if you need the URL for the item, use get_url() instead of get_path()
            openerPage.OnFileSelected(item.get_path());// Call the method declared on the parent page
 
            //Close the window which hosts this page
            wnd.close();
        }
    }
 
    global.OnClientFileOpen = OnClientFileOpen;
})(window);