    refresh: ->
     n = 0
     n++ for c of @columns
-    if n > 0
+    if n > 1
      @elems.btn.style.display = 'block'
     else
      @elems.btn.style.display = 'none'


   @initialize ->
    @elems.inputs = {}

   operationName: 'Reverse Cross Tabulate'
   @operationName: 'Reverse Cross Tabulate'

    @table.refresh()

   apply: ->
    n = 0
    for col, i in @table.columns when @columns[i]
     id = col.id
     n++
    id = "#{id}_0"

    data = {}
    for col, i in @table.columns when not @columns[i]
     data[col.id] = []
     for d in @table.data[col.id]
      for j in [0...n]
       data[col.id].push d

    @table.size *= n

    data[id] = new Array @table.size
    m = 0
    for col, i in @table.columns when @columns[i]
     for d, j in @table.data[col.id]
      data[id][m + j * n] = d
     m++

    columns = []
    for col, i in @table.columns
     if not @columns[i]
      columns.push col

    @table.columns = columns
    @table.data = data


  OPERATIONS.set ReverseCrossTabulate.type, ReverseCrossTabulate
