title: bypass tab click in tabbed page
body: <p>My application is using a tabbed page to separate 2 main areas. Using Xamarin.Forms 4.x and Prism.</p>
  
  <p>The first tab basically hosts a set of linear navigated views modelling a workflow.   It's been identified that when a user has progressed through the workflow, and accidentally taps on the current tab, the user is popped back to the start of the navigation.</p>
  
  <p>Is there any way to bypass this event?</p>
  
  <p>This only seems to happen on iOS.</p>