use the MDI windows example source code, the code integrity, and I hope to help you.

Packet : 1985544mdi窗体结构示例.rar filelist
Demos
Demos\Project1.dof
Demos\Unit1.pas
Demos\Unit1.dfm
Demos\Unit2.pas
Demos\Unit2.dfm
Demos\Project1.dpr
Demos\Project1.cfg
Demos\Project1.res
Demos\Unit2.dcu
Demos\Unit1.dcu
Demos\Project1.exe
Demos\Unit1.~pas
Demos\Unit1.~dfm
Demos\Unit1.ddp
Demos\Unit2.~pas
Demos\Unit2.~dfm
Demos\Unit2.ddp

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