How set Height Offset property nested Horizontal and vertical radspiltters?
<telerik:RadSplitter ID="MainSplitter" runat="server" Height="100%" Width="100%" Orientation="Horizontal" SplitBarsSize="2" HeightOffset="????">
<telerik:RadPane ID="TopPane" runat="server" Height="72" MinHeight="72" MaxHeight="120">
</telerik:RadPane>
<telerik:RadSplitBar ID="RadsplitbarTop" runat="server" CollapseMode="None"/>
<telerik:RadPane ID="MainPane" runat="server" Scrolling="none" MinWidth="500">
<telerik:RadSplitter ID="NestedSplitter" runat="server"
SplitBarsSize="8" HeightOffset="??????" VisibleDuringInit="false">
<telerik:RadPane ID="LeftPane" runat="server" Width="220">
<telerik:RadSplitter ID="RadSplitter2" runat="server" Orientation="Horizontal" SplitBarsSize="8" HeightOffset="??????" >
<telerik:RadPane ID="RadPane1" runat="server" Height="75%" Width="100%">
</telerik:RadPane>
<telerik:RadSplitBar ID="RadSplitbar2" runat="server" CollapseMode="Backward"
></telerik:RadSplitBar>
<telerik:RadPane ID="bottomPane" runat="server" Height="25%" Width="100%" >
</telerik:RadPane>
</telerik:RadSplitter>
</telerik:RadPane>
<telerik:RadSplitBar ID="VerticalSplitBar" runat="server" CollapseMode="Forward"/>
<telerik:RadPane ID="ContentPane" runat="server">
<asp:ContentPlaceHolder ID="ContentPlaceHolder1" runat="server">
</asp:ContentPlaceHolder>
</telerik:RadPane>
</telerik:RadSplitter>
</telerik:RadPane>
</telerik:RadSplitter>