WPF ControlTemplate: How to provide a default value for TemplateBinding?

Question

I am writing a WPF control that subclasses a Button. I then provide a default style in Themes\\generic.xaml, that looks like this (simplified):

                  
        
        

          

            
            

              
              

            
    


                                 
              
            
                          
    

        
         

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