wpf - Windows Phone 8.1, How to bind style to view? -

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I've written a style for the button. Unfortunately, I had to face a problem: the font size of the button depends on one value, which I use in the only view (in particular, this DisplayInformation stuff) I can count on

Ideally, I will do the following: 

  & lt; Style x: key = "MyStyle" basedOn = "{StaticResource SomeStyle}" TargetType = "Button" & gt; & Lt; Setter Property = "FontSys" value = "{binding element name = root control, path = some property" /> & Lt; / Style & gt;   
 Then, I only provide the necessary properties in the visual category.  
 How can I solve this problem?   
 
 
 Specifying the bond in the setter value is not supported in the Windows runtime (supported in WPF and Silverlight 5 Maybe, though).  
 If you are a Google near work, then you are working, but they are like Hank. See, which uses the attached properties and the binding assistant class.

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