这个工具栏控件由TToolBar继承，它增加了一个“最大化/恢复”按钮。这个按钮由Netscape浏览器中而来。单击这个按钮，工具栏缩小并隐藏其控制，再次单击则恢复。-the toolbar controls by TToolBar inheritance, it adds a "maximize / restore" button. Button from the Netscape browser from. Click the button, toolbar narrow and hidden under their control, then click again to resume.