title: Kivy Update Dynamic Label Text
body: <p>My goal is to watch the number count on the <code>Popup</code>. I have a <code>NumericProperty</code> being loaded. However, The numbers do not change when callback is called. (I do not have any code in callback linking to the label.text)</p>
  
  <p>Similar questions have been asked. But, I have been unable to see how they apply to this specific case. <a href="https://stackoverflow.com/questions/29712341/kivy-bind-label-text-to-variable-python-only">Similar Case</a></p>
  
  <pre><code>import kivy
  kivy.require("1.7.0")
  
  from kivy.app import App
  from kivy.uix.popup import Popup
  from kivy.uix.label import Label
  from kivy.uix.button import Button
  from kivy.uix.boxlayout import BoxLayout
  from kivy.properties import ObjectProperty
  from kivy.properties import NumericProperty
  from kivy.clock import Clock
  from kivy.event import EventDispatcher
  
  scoreInc = 0
  
  class MyPopup(Popup):
  
      def show_popup(self):
  
          content = BoxLayout(orientation="vertical")
  
          self.incrementerFnc = Clock.schedule_interval(self.incrementer, .005)
  
          scoreLabel = Label(text=str(ins.a), id='scorelabel', font_size=20)
  
          content.add_widget(scoreLabel)
  
          mybutton = Button(text="Close", size_hint=(1,.20), font_size=20)
          content.add_widget(mybutton)
  
          mypopup = Popup(content = content,              
                  title = "Score",     
                  auto_dismiss = False,         
                  size_hint = (.7, .5),         
                  font_size = 20)
          mybutton.bind(on_press=mypopup.dismiss)  
          mypopup.open()
  
      def incrementer(self, dt):
          global scoreInc
          scoreInc += 1
  
          ins.a = scoreInc
  
          if(scoreInc &gt;= 10):
              Clock.unschedule(self.incrementerFnc)
              print('quit')
          else:
              print('scoreInc', ins.a)    
  
  class MyClass(EventDispatcher):
      a = NumericProperty(0)
  
  def callback(instance, value):
      print('My callback is call from', instance)
      print('and the a value changed to', value)
  
  ins = MyClass()
  ins.bind(a=callback)
  
  
  class MyApp(App):     
  
      def build(self):
  
          mypopup = MyPopup()
  
          return mypopup.show_popup()
  
  if __name__ == "__main__":
      MyApp().run()
  </code></pre>