Expand RadPanelItems on Hover

The following sample code shows how RadPanelItems can be expanded/collapsed when you hover over them.

<form id="form2" runat="server">
   <div>
       <asp:ScriptManager ID="ScriptManager1" runat="server">
       </asp:ScriptManager>
       <script type="text/javascript">
           function ExpandItem(panelbar, args) {
               if (args.get_item().get_items().get_count() != 0 && args.get_item().get_expanded() == false) {
                   args.get_item().set_expanded(true);
               }
               else {
                   args.get_item().set_expanded(false);
               }
           }
       </script>
       <telerik:RadPanelBar RenderMode="Lightweight" ID="RadPanelBar1" runat="server" OnClientMouseOver="ExpandItem">
           <CollapseAnimation Duration="100" Type="None" />
           <Items>
               <telerik:RadPanelItem runat="server" Text="Root RadPanelItem1">
                   <Items>
                       <telerik:RadPanelItem runat="server" Text="Child RadPanelItem 1">
                       </telerik:RadPanelItem>
                       <telerik:RadPanelItem runat="server" Text="Child RadPanelItem 2">
                       </telerik:RadPanelItem>
                   </Items>
               </telerik:RadPanelItem>
               <telerik:RadPanelItem runat="server" Text="Root RadPanelItem2">
                   <Items>
                       <telerik:RadPanelItem runat="server" Text="Child RadPanelItem 1">
                       </telerik:RadPanelItem>
                       <telerik:RadPanelItem runat="server" Text="Child RadPanelItem 2">
                           <Items>
                               <telerik:RadPanelItem runat="server" Text="Child RadPanelItem 1">
                               </telerik:RadPanelItem>
                               <telerik:RadPanelItem runat="server" Text="Child RadPanelItem 2">
                                   <Items>
                                       <telerik:RadPanelItem runat="server" Text="Child RadPanelItem 1">
                                       </telerik:RadPanelItem>
                                       <telerik:RadPanelItem runat="server" Text="Child RadPanelItem 2">
                                       </telerik:RadPanelItem>
                                       <telerik:RadPanelItem runat="server" Text="Child RadPanelItem 3">
                                       </telerik:RadPanelItem>
                                   </Items>
                               </telerik:RadPanelItem>
                               <telerik:RadPanelItem runat="server" Text="Child RadPanelItem 3">
                               </telerik:RadPanelItem>
                               <telerik:RadPanelItem runat="server" Text="Child RadPanelItem 4">
                               </telerik:RadPanelItem>
                               <telerik:RadPanelItem runat="server" Text="Child RadPanelItem 5">
                               </telerik:RadPanelItem>
                           </Items>
                       </telerik:RadPanelItem>
                   </Items>
               </telerik:RadPanelItem>
               <telerik:RadPanelItem runat="server" Text="Root RadPanelItem3">
               </telerik:RadPanelItem>
               <telerik:RadPanelItem runat="server" Text="Root RadPanelItem4">
                   <Items>
                       <telerik:RadPanelItem runat="server" Text="Child RadPanelItem 1">
                       </telerik:RadPanelItem>
                       <telerik:RadPanelItem runat="server" Text="Child RadPanelItem 2">
                       </telerik:RadPanelItem>
                       <telerik:RadPanelItem runat="server" Text="Child RadPanelItem 3">
                       </telerik:RadPanelItem>
                       <telerik:RadPanelItem runat="server" Text="Child RadPanelItem 4">
                       </telerik:RadPanelItem>
                   </Items>
               </telerik:RadPanelItem>
           </Items>
           <ExpandAnimation Duration="100" Type="None" />
       </telerik:RadPanelBar>
   </div>
</form>