title: Windows phone:Do not allow more than one dot in a textbox?
body: <p>I am writing application in windows phone 8.</p>
  
  <p>I need to provide a textbox which will allow user to enter only "Numbers" and if required, only one dot ".</p>
  
  <p>I set <code>&lt;TextBox InputScope="Number" /&gt;</code> but it allow multiple dot.</p>
  
  <p>How can i set single dot in textbox of windows phone?</p>