Xceed.Wpf.Toolkit.AutoSelectTextBox.MoveFocusDown C# (CSharp) Méthode

    private bool MoveFocusDown()
    {
      int lineNumber = this.GetLineIndexFromCharacterIndex( this.SelectionStart );

      //occurs only if the cursor is on the first line
      if( lineNumber == ( this.LineCount - 1 ) )
      {
        if( ComponentCommands.MoveFocusDown.CanExecute( null, this ) )
        {
          ComponentCommands.MoveFocusDown.Execute( null, this );
          return true;
        }
        else if( this.CanMoveFocus( FocusNavigationDirection.Down, false ) )
        {
          this.MoveFocus( new TraversalRequest( FocusNavigationDirection.Down ) );
          return true;
        }
      }

      return false;
    }
  }