Creating custom style buttons (and other controls) from C++

Question

Using the information at http://msdn.microsoft.com/en-us/library/windows/apps/xaml/jj709909.aspx I was able to create very flexible custom buttons (Thanks Ron!) However, I am struggling to figure out how to create buttons programmatically in C++ based on the Style I created in XAML.  They work great from XAML but I cannot find any information on how to set the Style of a button created in C++ to the style I created in the app.xaml files.  I am not sure if I am going about it all wrong or if it is as simple as setting Style attribute of the button.  if it is the latter what do I set the button->Style to from my Style definition:

<Stylex:Key="BlockButton"TargetType="Button">

I would create all of the buttons in XAML but within my app they are too dynamic to manage effectively in XAML.

Thanks for any suggestions on how to do this! 

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Randy