private void cbRoles_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
if (this.cbRoles.SelectedValue == null)
return;
this.TridionFolder.TridionRole = (TridionRole)this.cbRoles.SelectedValue;
this.TridionSelectorMode = TridionSelectorMode.Folder;
this.treeTridionFolder.ItemsSource = MainService.GetPublications(this.CurrentMapping).Expand(this.CurrentMapping, this.TridionSelectorMode, this.TridionFolder.TcmIdPath, this.TridionFolder.TcmId).MakeExpandable();
}