DropShadow on PopupControl rounded corner error

I am trying to add rounded corners to my drop down calendar control but when I select rounded corners on the DropShadowExtender the calendar disappears. (http://www.mtechglobal.com/sample1.jpg)

If I set rounded corners to false, it works fine. (http://www.mtechglobal.com/sample2.jpg)

I'm also seeing a weird problem if I point the dropshadowextender to the Calendar control directly rather than the containing panel. It seems that the shadow is somehow mis-calculating the position of the control. (http://www.mtechglobal.com/sample3.jpg)

Here is my code:

<asp:Panel ID="Panel1" runat="server" CssClass="popupControl">
 <atlas:updatepanel id="UpdatePanel1" runat="server">
 <ContentTemplate>
 <atlasToolkit:PopupControlExtender ID="PopupControlExtender1" runat="server">
 <atlasToolkit:PopupControlProperties TargetControlID="txtFrom" PopupControlID="Panel1" Position="Bottom" />
 </atlasToolkit:PopupControlExtender>
 <atlasToolkit:DropShadowExtender ID="dse" runat="server">
 <atlasToolkit:DropShadowProperties TargetControlID="Panel1" Width="5" Rounded='false' Opacity=".5" TrackPosition="true" ID="dsBehavior" />
 </atlasToolkit:DropShadowExtender>
 <center>
 <asp:Calendar ID="calFrom" runat="server" BackColor="White" BorderColor="Black" CellPadding="2" DayNameFormat="Shortest" Font-Names="Verdana" Font-Size="8pt"
 ForeColor="#003399" Width="160px" OnSelectionChanged="calFrom_SelectionChanged" BorderWidth="1px" BorderStyle="Solid" >
 <SelectedDayStyle BackColor="#009999" Font-Bold="True" ForeColor="#CCFF99" />
 <TodayDayStyle BackColor="#99CCCC" ForeColor="White" />
 <SelectorStyle BackColor="#99CCCC" ForeColor="#336666" />
 <WeekendDayStyle BackColor="#CCCCFF" />
 <OtherMonthDayStyle ForeColor="#999999" />
 <NextPrevStyle ForeColor="#CCCCFF" VerticalAlign="Bottom" />
 <DayHeaderStyle BackColor="#99CCCC" Height="1px" ForeColor="#336666" Font-Bold="True" Font-Size="7pt" />
 <TitleStyle BackColor="#003399" ForeColor="#CCCCFF" BorderColor="#3366CC" Font-Bold="True" />
 <DayStyle CssClass="calDay" />
 </asp:Calendar>
 </center
 </ContentTemplate>
 </atlas:updatepanel>
</asp:Panel>
<atlasToolkit:DropShadowExtender ID="DropShadowExtender1" runat="server">
 <atlasToolkit:DropShadowProperties TargetControlID="Panel1" Width="5" Rounded='false' Opacity=".5" TrackPosition="true" ID="DropShadowProperties1" />
</atlasToolkit:DropShadowExtender>

Any ideas?oh and ignore the second one of these:

<atlasToolkit:DropShadowExtender ID="dse" runat="server">
 <atlasToolkit:DropShadowProperties TargetControlID="Panel1" Width="5" Rounded='false' Opacity=".5" TrackPosition="true" ID="dsBehavior" />
</atlasToolkit:DropShadowExtender>

cut and paste error. :)