'north' position in nested layout always shows blue title bar
i've worked through several examples and learned quite a few techniques over the past few weeks that i'm using in a new app. a problem i can't seem to figure out (searched, looked through css, *Layout.js, etc) is that all my 'north' positions want to add that dark blue 'title bar' across the top. if i add a toolbar/titlebar to that panel it just sets it slightly in and on top of that darn blue bar. my ui consists of a 'center' pane that is a nested layout of 'north', 'center', 'south' panes, each of which i want to look pretty similar, but my 'north' wants to add a blue bar! am i missing something obvious?