if (mIsBuilding) return NS_OK;
nsXULTemplateBuilder::OnMove(nsIRDFResource* aOldSource,                             nsIRDFResource* aNewSource,                             nsIRDFResource* aProperty,                             nsIRDFNode* aTarget){    NS_NOTYETIMPLEMENTED("write me");	if (mCache)	{		mCache->Move(aOldSource, aNewSource, aProperty, aTarget);	}    return NS_ERROR_NOT_IMPLEMENTED;}