Only one group visible and/or 'maximize' the current editor tab

I'm finding that is the Layout that defines how many Groups there are in the ST2. But sometimes I want to 'group' several files in one 'screen' and another bunch of files in another 'screen'. So, basically I could achieve that making only one group visible and then I could switch between them without being forced to split in Layouts. Or/And I could 'maximize'  the current editor (ie: like eclipse does double click in tab)