private void _valueSpinner_ValueChanged(object sender, ValueChangedEventArgs e)
 {
     this._editedIncentive.IncentiveValue = (float)e.NewValue;
     this._app.UI.SetText("txtValue", this._editedIncentive.IncentiveValue.ToString());
 }
 private void _durationSpinner_ValueChanged(object sender, ValueChangedEventArgs e)
 {
     this._editedTreaty.Duration = (int)e.NewValue;
     this._app.UI.SetText("txtDuration", this._editedTreaty.Duration.ToString());
 }