Rounded Corner Extender has problems with dynamic panels

I'm trying to create some panels, which are "glued" to the top and bottom, so the panel resize together with browser. It works fine, until I attach a Rounded Corner Extender. Then the rounded corners are positioned correct with the top, but the height are fixed somewhere near the top.

Here are the panel I try to add rounded corners to:

<asp:PanelID="PanelSideBar"runat="server"Style="position: absolute; top: 100px;left: 10px; bottom: 25px; width: 200px"BackColor="Beige"></asp:Panel>

<

ajaxToolkit:RoundedCornersExtenderID="RCExtender"runat="server"TargetControlID="PanelSideBar"></ajaxToolkit:RoundedCornersExtender>Thanks for reporting this. I have opened work itemhttp://www.codeplex.com/AtlasControlToolkit/WorkItem/View.aspx?WorkItemId=8769 for this.