private void DeleteButton_Click(object sender, RoutedEventArgs e)
{
ListViewView listView = FocusedTabControl.SelectedContent as ListViewView;
TreeListView treeListView = FocusedTabControl.SelectedContent as TreeListView;
if (listView != null)
{
listView.Delete();
}
else
{
treeListView.Delete();
treeListView.RefreshSelectedItem();
}
RefreshTabs();
}