title: Text box value format
body: <p>I have a textbox. It can accepts numeric as well as alphabets. I need to format the value of text box at run time such that whenever a Numberic/Alphabet is pressed and the previous is of other category(Alphabet/Numeric), it should automatically insert a <code>-</code> sign.</p>
  
  <p>For example: <code>AB108B8</code> should be formatted as <code>AB-108-B-8</code></p>
  
  <p>Please help me with this.</p>