private static void onTextContentPropertyChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
        {
            InterruptionCellControl thisControl = sender as InterruptionCellControl;

            if (e.NewValue != null && thisControl.m_EditText != null)
            {
                thisControl.m_EditText.Text = (string)e.NewValue;
            }
            thisControl.NotifyPropertyChanged("DisplayText");
        }
        private static void onVirtualTimeShownPropertyChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
        {
            InterruptionCellControl thisControl = sender as InterruptionCellControl;

            thisControl.NotifyPropertyChanged("DisplayText");
        }