Now I was able to reproduce the issue and was able to find a work-around. What I did was to change the code of the Area_ElementLoaded method to the following:
sender, LayoutSerializationEventArgs e)
var pane = (RadPane)e.AffectedElement;
pane.Template = ((RadPane)e.AffectedElement).DocumentHostTemplate;
I will log the issue and we will fix it for one of the upcoming releases.
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