Problem with progress bar in IE Treeview Control

[Rams]

I am using the Tree view Control .I have the following code .
<div id="divTreeView" style="BORDER-RIGHT: gray 1px solid; BORDER-TOP: gray
1px solid; OVERFLOW: auto; BORDER-LEFT: gray 1px solid; BORDER-BOTTOM: gray
1px solid">
<iewc:treeview id="TreeView1" runat="server" BorderWidth="0px"
AutoPostBack="true" BackColor="White"
BorderColor="Silver" BorderStyle="Solid" ExpandLevel="10"
EnableViewState="False"></iewc:treeview>
</div>
The scroll bar is added and working fine .
When ever I try to expand a node whose length is greater than the screen
size then , the horizontal scroll bar activates itself and I am not able to
expand such nodes . It works fine if the node length is smaller than the
screen size . Hope you are able to get the problem .
Please share your solutions..........
Thanks
Rams