尝试检查以下链接:使用VB.Net的简单可停靠表单 [像Dock容器一样的Visual Studio IDE [

Hi,
try to check following link: Simple Dockable Form With VB.Net[^]
I know that it is on vb.net but rewrite it to c# couldn''t be a problem

this one could be better:
Visual Studio IDE like Dock Container[^]

不要忘记 ^ ]，对我有用.

Not to forget DockPanel Suite[^], which works for me.