BarHeight
float BarHeight() const;
fBarberPole->SetExplicitMinSize(BSize(0, fStatusBar->BarHeight()));
fBarberPole->SetExplicitMaxSize(BSize(B_SIZE_UNLIMITED, fStatusBar->BarHeight()));
*_height = labelHeight + BarHeight();
float oldHeight = BarHeight();
return BRect(2, top, Bounds().right - 2, top + BarHeight() - 4);
sScreenTopOffset = gScreen->BarHeight * 2; // ???
int8 BarHeight, BarVBorder, BarHBorder, MenuVBorder, MenuHBorder;