如何将一个textblock属性继承到c#中的自定义控件?

I have a custom wpf control. It is basically a textblock which has an ability to apply fill and stroke to the text. It is already inherited by a class. The problem is that it does not have some textblock properties like fontfamily. I want to inherit this control with textblock so it can use its all properties. The custom control code is given belowI have a custom wpf control. It is basically a