I have deeply nested custom user controls and I'm trying to use $find("<%= RadTabStrip1.ClientID %>") deep within the hierarchy to find an "ancestor" control. For some reason I get a Javascript error saying that there are no properties for it. But when I execute the same Javasript function in the same user control that has RadTabStrip1, it works fine. So can I use $find to find a control 4 parents up the hierarchy for example, or am I only supposed to use $find in the same aspx page that has the control? I'm trying to troubleshoot to see if this is the problem or might be something else. Thanks for any help on this.