move apis into rom/modules/main for shell compatibility

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

@@ -0,0 +1,21 @@
+local class = require('opus.class')
+local UI    = require('opus.ui')
+
+local colors = _G.colors
+
+--[[-- DropMenuItem --]]--
+UI.DropMenuItem = class(UI.Button)
+UI.DropMenuItem.defaults = {
+	UIElement = 'DropMenuItem',
+	textColor = colors.black,
+	backgroundColor = colors.white,
+	textFocusColor = colors.white,
+	textInactiveColor = colors.lightGray,
+	backgroundFocusColor = colors.lightGray,
+}
+function UI.DropMenuItem:eventHandler(event)
+	if event.type == 'button_activate' then
+		self.parent:hide()
+	end
+	return UI.Button.eventHandler(self, event)
+end