title: how to know the name of the selected tab? (MVVM)
body: <p>I have a view model that control the click event of a button, the code is:</p>
  
  <pre><code>ucMantenimientoView miViewPlanificacion = new ucMantenimientoView();
  ucMantenimientoViewModel miViewModelPlanificacion = new ucMantenimientoViewModel();
  miViewPlanificacion.DataContext = miViewModelPlanificacion;
  </code></pre>
  
  <p>The view has a tab, and with MVVM Light I manage the click event on the view model of the selectedItem event of the tab control.</p>
  
  <p>The problem is that I need to know which is the name of the selected tab in the creation of the view and the view model, but the selectedItem is not fire, by default is selected the first tab, so I don't know how can I get the name of the selected tab in the creation of the view model.</p>
  
  <p>If I select another tab and later I select the first tab, then it works, but I need this data in the constructor of the view model.</p>
  
  <p>Thanks.</p>