public virtual void OnFocuserValueChanged(FocuserValueChangedEventArgs e)
 {
     if (FocuserValueChanged != null)
     {
         FocuserValueChanged(this, e);
     }
 }
 private void FocuserValueChanged(object sender, FocuserValueChangedEventArgs e)
 {
     //this.textBoxCurrentPosition.Text = e.NewValue.ToString();
     SetCurrentPosition(e.NewValue);
 }