用所有控件放在Grid border 等等容器里，然后再定义其下所有元素的PreviewKeyDown事件：
PreviewKeyDown="grid_main_PreviewKeyDown"
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private void Grid_PreviewKeyDown(object sender, KeyEventArgs e)
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{
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var uie = e.OriginalSource as UIElement;
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if (e.Key == Key.Enter)
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{
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e.Handled = true;
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uie.MoveFocus(new TraversalRequest(FocusNavigationDirection.Next));
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}
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}
作用于窗口所有控件的话，定义Window_KeyDown事件。