hellow together!

I have one problem to make mdi form design.
i wanna design look like under

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| tool bar |
| |
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| | |
| tree | fixed form |
| view | |
| |---------------------------------------------|
| |mdi child here! |
| | |
| | |
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tool bar and tree view is possible but fixed form(or picture box)
not fix like that.

no ways here?