 
 		@addClass("cui-data-field--with-button")
 
-		btn = new CUI.defaults.class.Button
+		@__calendarButton = new CUI.defaults.class.Button
 			icon: "calendar"
 			tooltip: text: CUI.DateTime.defaults.button_tooltip
 			onClick: =>
-				@openPopover(btn)
-
-		@replace(btn, "right")
+				@openPopover(@__calendarButton)
+
+		@replace(@__calendarButton, "right")
 		# @append(@__status = CUI.dom.div("cui-date-time-status"), "center")
 
 	format: (_s, type="display", output_type=null) ->

					buttons: [
						icon: "left"
						group: "year"
						onClick: (ev) =>
							if data.year-1 < @_min_year
								return
							mom.subtract(1, "years")
							@drawDate(mom)
					,

					,
						icon: "right"
						group: "year"
						onClick: =>
							if data.year + 1 > @_max_year
								return
							mom.add(1, "years")
							@drawDate(mom)
