North
This is a custom content between layout panes.

Any elements can be placed here.
Center-North
Center-Center
Click on the buttons to see that scrollbars in the west pane are well adjusted and messages preserve their place when scrolling.
SubjectTextSubjectTextSubjectText
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subject 1text 1subject 1text 1subject 1text 1
subject 2text 2subject 2text 2subject 2text 2
subject 3text 3subject 3text 3subject 3text 3
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subject 11text 11subject 11text 11subject 11text 11
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subject 21text 21subject 21text 21subject 21text 21
subject 22text 22subject 22text 22subject 22text 22
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subject 29text 29subject 29text 29subject 29text 29
South