DropDownTree in RadAjaxPanel with LoadingPanel, Press Enter Key will trigger Infinite loading

[n/a]

I define a DropDownTree in RadAjaxPanel with LoadingPanel.

I open the DropDownTree and use keyborad ↑↓ to find a item, then I press enter key to select some one.

It will trigger Infinite loading.

(Mouse operation is working fine, but keyborad doesn't work.)

 

Can anyone help? THX~

 

<telerik:RadAjaxPanel ID="RadAjaxPanel1" runat="server" LoadingPanelID="LoadingPanel1">

     <telerik:RadDropDownTree RenderMode="Lightweight" ID="rddtCustomer" runat="server" Width="300px" Skin="Default" AutoPostBack="true"               EnableFiltering="true" OnEntryAdded="rddtCustomer_EntryAdded" ></telerik:RadDropDownTree>

</telerik:RadAjaxPanel>