RadToolBar for ASP.NET AJAX Version Q3 2008 released 11/25/2008 (release history)

The ExpandAnimation and CollapseAnimation properties of RadToolBar are used to customize the way the dropdown items (RadToolBarDropDown and RadToolBarSplitButton) are expanded and collapsed. For each expand or collapse animation, you can specify Type and Duration:

• The Type is chosen from a list of predefined animation effects.
• The Duration is set in milliseconds.

To disable expand animation effects, set the Type to AnimationType.None.

The subproperties of the ExpandAnimation and CollapseAnimation properties can be modified both on the client and the server.

<telerik:RadToolBar id="RadToolBar1" Runat="server" Skin="Vista">
    <ExpandAnimation Type="OutQuart" Duration="300" />
    <CollapseAnimation Type="OutQuint" Duration="200" />
    <Items>
        ...
    </Items>
</telerik:RadToolBar>