windows phone - Dynamic appbar icon with text -

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I'm working on WP8.1 app.

I have a circle in the appetizer, a button icon (transparent PNG).

In addition to this I have a textbox on the app's screen. When I enter a number in that text box, can I show that number also in the middle of the circle in the appbar?

In other words, I can have dynamic text content in the WP 8.1 app bar, a transparent app button button top or bottom of the icon?

Yes, you can add that number to that AppBar . You should first get the value entered in the text box using the tag property. Then pass the value to the app's text property using the name given by you: 

  sampleAppBar.Text = // value from the text box    
 
  
 Hope it helps!

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