title: WPF: trigger to check if TabControl has only 1 tab!
body: <p>Is there any trigger I can create to see if a Tabcontrol has only one TabItem. In these cases I actually have a TabItem collection in the codebehind wich I could possibly use a count method on.</p>
  
  <p>In the case of only one tab I wan't to hide the TabPanel. Can I just call visibility=collapse on it?</p>