title: add a tab programically, c# tab control
body: <p>hi everybody
  i want to ask :
  How to add a tab programmically.</p>
  
  <p>for my problem
  i have a tab control, as default only one tab. and i have a button when i click that button will add one other tab. so will be two tab.</p>
  
  <p>please help me using c# and xaml.</p>