 		date_sel = new Select(
 			name: "date"
 			data: data
+			group: "date"
 			onDataChanged: =>
 				@updateCalendar(mom.date(data.date))
 			options: =>

		month_sel = new Select(
			name: "month"
			data: data
			onDataChanged: =>
				@updateCalendar(mom.month(data.month))
			options: =>


		##### HEADER includes YEAR and MONTH
		header_year_month = new HorizontalLayout
			maximize_vertical: false
			maximize_horizontal: true
			left:
				content: new Buttonbar
					class: "cui-date-time-header-month"
