title: wpf progressbar databind to command
body: <p>I would like to use a progressbar in a simple way.  I have a query that is run to return data to a grid when a user clicks a button.  I would like to start the progressbar when the button is clicked and stop the progressbar when the data is returned to the grid.</p>
  
  <p>I just want the progressbar to continue on (IsIndeterminate="True") to show that there is actually something happening.</p>
  
  <p>Is there any way to bind the start and stop of the progressbar to properties or commands in my view model?</p>
  
  <p>Thanks for any thoughts.</p>