C# 下拉幻灯片表单
是否有任何内置控件，例如下拉菜单/滑块？例如，我想在对话框/控件/表单上显示一些信息，并且该表单内有一个箭头可以将其展开以显示更多信息？
替代文本 http://img227.imageshack.us/img227/4945/73068794.jpg< /a>
当我单击黑色箭头时，表单应垂直展开以显示更多信息。这就是我想要实现的目标。如果没有任何内置控件，您能告诉我我需要做什么来自己实现它吗？如何在展开时添加一点动画？
就像这里（当您单击菜单标题时，它不会立即展开/收缩，而是它的速度很慢，这就是我想添加的动画）
Is there any built-in control like a dropdown/slider? For instance, I want to display some info on dialog/control/form and inside that form there is a arrow which expands it to show more information?
alt text http://img227.imageshack.us/img227/4945/73068794.jpg
When I click the black arrow, the form should expand vertically to show more info. That's what I want to achieve. If there isn't any built-in control, can you please tell me what do I need to do to implement it myself? And how can I add a little animation when it is expanding?
Like here (when you click the menu header it doesn't expand/contract instantly rather it does little slowly, that's the kind of animation I would like to add)
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