管理程序自身的图形面板需要响应调整大小事件。
Graphical panels that your program manages itself need to respond to resize events.
图形会出现在目前选取的图形面板中，并取代该面板中原先显示的图形。
It appears in the currently selected graph panel; it replaces the graph that was displayed in that panel.
接下来可以使用标准的图型工具创建概要文件元素：图形面板、模型助手、操作工具栏和弹出菜单。
Profile elements can be then created using standard diagram tools: diagram palette, modeling assistant, action bar, and pop-up menu.
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