I am using controls in a 2.0 app, with 3.5 .NET installed - gridPanel displays and the only way that I can get it to work at all is if I list out all of the attributes in the ScriptManager - like below - but when I do - the CSS on the page gets all blown out -

<ext:ScriptManager ID="ScriptManager2" runat="server" IDMode="Inherit" Theme="Default" 

ScriptAdapter="Ext" ScriptMode="Release" StateProvider="PostBack" RenderScripts="Embedded" 

SourceFormatting="false" RenderStyles="Embedded" CleanResourceUrl="false" QuickTips="true" AjaxEventUrl="" 

AjaxViewStateMode="Default" />