private void Pivot_OnSelectionChanged(object sender, SelectionChangedEventArgs e)
{
var parentVisible = GridMore.Visibility == Visibility.Visible && PivotMore.SelectedItem == PivotItemVariables;
//ViewModel.IsAddLocalVariableButtonVisible = parentVisible && PivotVariables.SelectedItem == PivotItemLocalVariables;
//ViewModel.IsAddGlobalVariableButtonVisible = parentVisible && PivotVariables.SelectedItem == PivotItemGlobalVariables;
}