You can customize the way the panel-items expand and collapse.
    
        The ExpandAnimation and CollapseAnimation tags
        of RadPanelBar are used to customize the way groups 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 ExpandDelay and CollapseDelay properties set
        the period of time (in milliseconds) between clicking the item and the children
        starting to expand or collapse respectively.
    
    <telerik:RadPanelBar ID="RadPanelBar1" runat="server"/>
        <ExpandAnimation Type="OutQuart" Duration="300" />
        <CollapseAnimation Type="OutQuint" Duration="200" />
        ...
    </telerik:RadPanelBar>