You can customize the way the child TreeNodes expand or collapse.
        The ExpandAnimation and CollapseAnimation tags
        of the RadTreeView object control the expand/collapse animations.
    
    
        For each expand or collapse animation, you can specify its Type
        and Duration:
    
    
        - The Type is chosen from a list of predefined animation effects.
        
- The Duration is set in milliseconds. 
        To disable the animation effects, set the Type to AnimationType.None.
    
    
    <telerik:RadTreeView ID="RadTreeView1" runat="server" Skin="Vista"/>
        <ExpandAnimation Type="OutQuart" Duration="300" />
        <CollapseAnimation Type="OutQuint" Duration="200" />
        ...
    </telerik:RadTreeViewu>