wiform MDI子窗口显示问题

在线等！！！~~我的父窗体布局如下：
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|         |                   |
|         |                   |
|         |                   |
|         |                   |
|  区域1  |      区域2        |
|         |                   |
|         |                   |
|         |                   |
|         |                   |
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我现在只想MDI子窗体在区域2范围内 显示 和 移动 
怎么实现，有什么控件吗？