如何扩展DataTemplate以包含其他控件

So I've got a style, which does some fancy things to a wpf TabControl, among which it sets a HeaderTemplate that allows users to rename the tab. I've got a style which is based on this template that colors the text based on some parameter, and I would like to add a polygon to the header of each tab depending on some conditions.So I've got a style, which does some fancy thin