源代码说明： This button automatically provides the "Unfolding dialog box" functionality found in some Windows programs. When you drop the button on the form, it will resize the form at application startup to just below the bottom of the button (You can change that distance with the AdditinalSpace property). When the button is pressed, the dialog unfolds to be the size it was in the designer.
自动打开对话框的按钮

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