Panel里怎么空置布局啊？除了套表格

在Panel里 我放了两个listbox和两个button 实现一个多选的功能，
   ---------                 ----------
  |        |                |         |
  |        |                |         |
  |        |                |         |
  |        |                |         |
  |        |                |         |
  |        |                |         |
  ---------- [添加] [删除]    -----------
大概就是这模样吧   这四个控件是放在一行的  怎么把中间两个按钮放在一列呢  像这样   ---------                 ----------
  |        |                |         |
  |        |    [添加]      |         |
  |        |                |         |
  |        |                |         |
  |        |                |         |
  |        |                |         |
  ----------    [删除]      -----------
？？？？大概就这样  不截图了