/// <summary>
 /// Constructor with the session to wich the materials are going to be uploaded
 /// </summary>
 /// <param name="selectedSession"></param>
 public VMaterialUpload(Session selectedSession)
 {
     InitializeComponent();
     this.selectedSession = selectedSession;
     (this.DataContext as UploadMaterialViewModel).CurrentSession = selectedSession;
 }
 /// <summary>
 /// Constructor with the session to wich the materials are going to be uploaded
 /// </summary>
 /// <param name="selectedSession"></param>
 public VMaterialUpload(Session selectedSession)
 {
     InitializeComponent();
     this.selectedSession = selectedSession;
     (this.DataContext as UploadMaterialViewModel).CurrentSession = selectedSession;
 }