Selectable panels

I’m trying to replicate the selectable squares in the Vaadin Sampler for the Runo Theme (Themes → Runo Theme → Style References → Layouts) but it’s just not working. CSSLAYOUT_SELECTABLE and the like have no effect, and my attempts at changing the panel or button css (I’ve’ tried both for this) don’t work the way I want them to. (For instance, Panel refuses to stop showing scrollbars even when setScrollable is false and overflow is hidden)

Can anyone provide the source code for these components? Since I can’t find it in the sampler. Basically I’m trying to create a compound button bar like in the Chameleon samples, but I need bigger buttons and the existing button styles don’t suit my needs. (Not to mention that I can’t even get the segment theme to work)