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The OnClientDropDownOpened client-side event occurs immediately after the drop-down expands to show its child buttons.

The event handler receives two parameters:

  1. The instance of the toolbar firing the event.

  2. An eventArgs parameter containing the following methods:

  • get_item returns a reference to the RadToolBarItem that was opened. In this case it is a drop-down.

  • get_domEvent returns the browser's event object

You can use this event to respond to an action right after the drop-down has been expanded:

    function OnClientDropDownOpened(sender, args) {

<telerik:RadToolBar RenderMode="Lightweight" ID="RadToolBar1" runat="server" Orientation="Horizontal" 
    <CollapseAnimation Duration="200" Type="OutQuint" />
        <telerik:RadToolBarButton Text="button1" runat="server">
        <telerik:RadToolBarDropDown Text="dropdown" runat="server">
                <telerik:RadToolBarButton Text="Button2" runat="server">
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