title: How to change the label font size dynamically?
body: <p>I wrote some wpf application that contain labels.
  I want to change the label font size according to the screen .. that mean that if the user will maximize the application window - the font will grow up - if he will change the size to small window - the font will shrink. </p>
  
  <p>I try a lot of solutions - but the font size is not changing. </p>
  
  <p>need help ... </p>
  
  <p>Thanks.</p>