Applying a UI to a whole site

[ALobpreis]

Hello,

I'd like to know if there is a way to apply a UI ("Primary" for example) to a whole site. The default theme looks quite washed-out and pale to me and this UI looks much better. Previously we used the Slate theme (RIP), which had a very good contrast (I know Ext.Js removed it).
From what I've seen, it seems the only way is to add the UI attribute to every panel, button, etc, as this attribute doesn't seem to be inherited. Is that right? Can that cumbersome approach be avoided?

Thanks and regards,

Andrew

[ALobpreis]

Another question: can a UI be applied to a BottomBar, like a Toolbar or PagingToolbar? If I do it, the toolbar loses its theme and a black line appears on some borders. Applying the UI to the toolbar components doesn't seem to do anything.

Thanks and regards,

Andrew