Ext.grid.GridPanel hides himself when collapses

[Biohazard]

Hi, I've this issue with GridPanels (I suppose that it should happen even with Panels): the header, where the title is filled, after the collapse's animation, has the width setted to 0. Firebug helped me to find it out and set it on 100% and it's all ok, there's also the expand button... but how can I specify that I don't want the hiding of this header on collapse? I've seen collapseCls, but there's some other config option that could help me?

[mitchellsimoens]

This was a bug in 4.0.7 and before and was fixed in 4.1.0

[Biohazard]

Thanks!