■ InputManager 클래스 : 키 이벤트 발생시키기
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using System.Windows.Input;
KeyEventArgs e = new KeyEventArgs(Keyboard.PrimaryDevice, Keyboard.PrimaryDevice.ActiveSource, 0, Key.Enter);
e.RoutedEvent = Keyboard.KeyDownEvent;
e.Source = this.textBox;
InputManager.Current.ProcessInput(e);
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