Catrobat.IDE.WindowsPhone.Views.Editor.Formula.FormulaEditorView.FormulaEditorView_OnUnloaded C# (CSharp) Method

        private void FormulaEditorView_OnUnloaded(object sender, RoutedEventArgs e)
        {
            this.FormulaViewerMain.ClearValue(FormulaViewer.TokensProperty);
            this.FormulaViewerMain.ClearValue(FormulaViewer.CaretIndexProperty);
            this.FormulaViewerMain.ClearValue(FormulaViewer.SelectionStartProperty);
            this.FormulaViewerMain.ClearValue(FormulaViewer.SelectionLengthProperty);
            this.FormulaKeyboard.ClearValue(Controls.FormulaControls.FormulaKeyboard.CanDeleteProperty);
            this.FormulaKeyboard.ClearValue(Controls.FormulaControls.FormulaKeyboard.CanEvaluateProperty);
            this.FormulaKeyboard.ClearValue(Controls.FormulaControls.FormulaKeyboard.HasErrorProperty);
            this.FormulaKeyboard.ClearValue(Controls.FormulaControls.FormulaKeyboard.ProgramProperty);

            //_viewModel.PropertyChanged -= ViewModel_OnPropertyChanged;
        }