本文探讨了在调用控件的Focus方法时可能遇到的问题，特别是当控件不可见时焦点无法设置的情况。文章建议通过为控件设置合适的TabIndex来确保控件能够获得焦点。
2.3 Why do calling Focus() on a control not set focus on it? |     |
| Note that when you call this method the control should be visible, otherwise the focus will not be set. Hence calling this in say Form_Load on a control in the form will be ineffective. You should instead consider give that control an appropriate TabIndex, so that it will be the first focused control. |
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