title: Require Input in Masked Text Box
body: <p>I have a masked text box (number of days) in a form that has to <strong>always</strong> have an integer inside. It <strong>cannot</strong> be blank when the user pressed the "OK" button on the form.</p>
  
  <p>What I need is when the user pressed "OK", if the text box is not filled as it should be, a tool tip come up and show the user they need to enter information there before they can proceed.</p>
  
  <p>What should I use for this? I'm guessing a variation of a Tool Tip and Masked Text Box, I just need a push in the right direction as I can't find the information anywhere.</p>