RadGrid ItemCommand event not firing

[Trevor]

I have a RadGrid with a hierarchy view (about 5 levels deep).  I bind programmatically in the OnPreRender event.  EnableViewState=false.  The ItemCommand event fires for any item in the first three levels of the hierarchy but when I try to expand something beyond that level, the event doesn't fire anymore.  Any ideas?

Trevor 

[Trevor]

Setting HierarchyLoadMode="ServerBind" on the parent DetailTable fixed the problem.