use layout() where appropriate and cleanup

sys/modules/opus/ui/components/DropMenu.lua

@@ -41,14 +41,28 @@ end
 
 function UI.DropMenu:enable()
 	local menuBar = self.parent:find(self.menuUid)
+	local hasActive
+
 	for _,c in pairs(self.children) do
 		if not c.spacer and menuBar then
 			c.inactive = not menuBar:getActive(c)
 		end
+		if not c.inactive then
+			hasActive = true
+		end
 	end
 
+	-- jump through a lot of hoops if all selections are inactive
+	-- there's gotta be a better way
+	-- lots of exception code just to handle drop menus
+	self.focus = not hasActive and function() end
+
 	UI.Window.enable(self)
-	self:focusFirst()
+	if self.focus then
+		self:setFocus(self)
+	else
+		self:focusFirst()
+	end
 	self:draw()
 end
 
@@ -59,7 +73,7 @@ end
 
 function UI.DropMenu:eventHandler(event)
 	if event.type == 'focus_lost' and self.enabled then
-		if not Util.contains(self.children, event.focused) then
+		if not (Util.contains(self.children, event.focused) or event.focused == self) then
 			self:disable()
 		end
 	elseif event.type == 'mouse_out' and self.enabled then