     options.hasPlusIcon   ?= no
 
     super options, data
+
+    @machineBoxes = []
+    @machineBoxesByMachineUId = {}
 
     @createHeader()
     @addMachineBoxes()


  addMachineBoxes: ->

    @machineBoxes = []

    for machineData in @getData()
      @addMachineBox machineData


    machineBox = new SidebarMachineBox {}, machineData
    @addSubView machineBox
    @machineBoxes.push machineBox
    @machineBoxesByMachineUId[machineData.machine.uid] = machineBox


  deselectMachines: ->
