(Layout) Doubleclick divider to expand/collapse

In all of the samples I’ve seen on this site of the Layout, when you double-click the dividing line between two cells, it collapses/expands that cell.
dhtmlx.com/docs/products/dht … bject.html

Is there an extension I need to include to get this functionality, as it doesn’t seem like my Layout component is doing that by default.

This is default behaviour. Make sure that you are using the latest version.

Weird. It works in nearly all the samples that I got with my download, and using the exact same files that those samples are using, it doesn’t work within my application.

Having looked into it, I think there is a bug. If you look at the following two samples:
dhtmlx.com/docs/products/dht … rdion.html
dhtmlx.com/docs/products/dht … abbar.html

and try to collapse cell A by double-clicking on the divider, it doesn’t work. This is the same thing I experience (but I’ve attached a dhxGrid object in cell A).