Multiple Popup Controls in PopupControlExtender

This is the code i have.

<atlasToolkit:PopupControlExtenderID="PopupControlExtender1"runat="server">

<atlasToolkit:PopupControlPropertiesPopupControlID="Panel1"Position="Bottom"TargetControlID="txtFrom"/>

<atlasToolkit:PopupControlPropertiesPopupControlID="Panel1"Position="bottom"TargetControlID="txtTo">

</atlasToolkit:PopupControlProperties>

</atlasToolkit:PopupControlExtender>

I get the following error message. But, if i remove one of the popupcontrols it works fine. AtlasControlToolkit version is 1.0.60914.0. What am i doing wrong.

Couldn't get extender properties on extender PopupControlExtender1. Make sure the ID is spelled correctly and the control is on the page.

Please include the complete error information and post a complete, simple sample page if you could.