partition manager + tab/wizard rework

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

@@ -4,7 +4,7 @@ local UI    = require('opus.ui')
 UI.Tab = class(UI.Window)
 UI.Tab.defaults = {
 	UIElement = 'Tab',
-	tabTitle = 'tab',
+	title = 'tab',
 	y = 2,
 }
 
@@ -14,3 +14,8 @@ function UI.Tab:draw()
 	end
 	self:drawChildren()
 end
+
+function UI.Tab:enable()
+	UI.Window.enable(self)
+	self:emit({ type = 'tab_activate', activated = self })
+end