Thank you
If you have any ideas, I am still open for it.
What is necessary to do to stabilize PSPad is leave MDI scheme and go to way
with dockable forms. MDI implementation is very buggy and I have to workaround
lot of things. 
But it means overwrite lot of code :-(

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PSPad freeware editor https://www.pspad.com

Odpovedet emailem