       opts.element.append @figure
       @figure
 
-    default: ->
-      @wrappedMathTag("")
-
     wrappedMathTag: (content)->
       """
       <math xmlns=\"http://www.w3.org/1998/Math/MathML\">

#= require almond_wrapper
#= require lib
#= require jquery

ttm.define 'widgets/ui_elements', ['lib/class_mixer'], (class_mixer)->
  class Button
    initialize: (@opts={})->
    render: (opts={})->

      """

    update: (mathml)->
      @mathml_renderer.render(@figure, @wrappedMathTag(mathml))

  class_mixer(MathMLDisplay)

