layout throws error if cell collapse by clicking header icon

Hey Guys, still working on confirm earlier fixes you have provided. I will let you know soon how those work. ITMT, here is another issue:

Behavior: The attached layout configuration initializes without error, but then throws an exception if the main layout cell “a” is collapsed by clicking on the double << icon in the header.

This behavior goes away if I comment out the last line of js code: mainLayout.cells(“c”).collapse();

Hope you have a fix. And much appreciate your continued great service.


---- begin code sample ----

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please, check attached sample - the issue is not reproduced (75.4 KB)