代码说明： 工具条组件，有最大，恢复按钮 TdfsToolBar .A descendant of the TToolBar component (D3, C3, & D4) that adds a "maximize - restore" button. This mimics the behavior of the toolbar in Netscape Communicator. Clicking the button makes the toolbar small, hiding its controls. Clicking again returns it to normal. Note that this version will not have the ability to collapse multiple toolbars into a single tab line like Netscape. That feature will not be added until v2.0.

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