title: Embedding a ProgressBar in the TabItem header in WPF
body: <p>The project I am working on generates a series of tabs for each item opened by the user. For some tabs in particular, certain database hits and calculations take an extended period of time. I was trying to determine a simple way to alert the user when the tab is ready and figured a progress bar would be as good or better than other ways I considered.</p>
  
  <p>I am wondering if there is a way to embed a progress bar behind the header text of a TabItem or if I will need to build my own CustomControl. I have no clue how to do either, however, I think some examples of the latter exist in the project so I could try to figure that out through them.</p>