Thanks for reply, this solution works, but unstable for my case.
Here my grid with buttons 82200609b2.png
It is in card layout, and somtimes after hide/show events it is shows like this: d921168a60.png
After resize panel buttons apears. Need to insert doLayout() somewhere?
Sometimes it looks like this: ff3002cb74.png and resize don't help.
On Ext 4.0.7 everything worked fine, after I wrote small override in Ext.layout.component.AbstractDock afterRemove method
UPD: if set button height, works fine. "scale:large" don't work.