void IView.SetTrackingChangesCheckBoxState(TrackingChangesCheckBoxState state)
        {
            CheckState newState;

            if (state == TrackingChangesCheckBoxState.Indeterminate)
            {
                newState = CheckState.Indeterminate;
            }
            else if (state == TrackingChangesCheckBoxState.Checked)
            {
                newState = CheckState.Checked;
            }
            else
            {
                newState = CheckState.Unchecked;
            }

            if (trackChangesCheckBox.CheckState != newState)
            {
                trackChangesCheckBox.CheckState = newState;
            }
        }
 void IView.SetTrackingChangesCheckBoxState(TrackingChangesCheckBoxState state)
 {
     // not supported in this UI
 }