title: Python3 Kivy Multiple DropDown Menus not working
body: <p>I am attempting to write an application in Kivy but have run into an issue. When I add a second dropdown menu (called <code>NotesDropDown</code>) both of the dropdown menus stop working.</p>
  <p>Here is the main code:</p>
  <pre><code>from kivy.app import App
  from kivy.uix.widget import Widget
  from kivy.uix.stacklayout import StackLayout
  from kivy.uix.dropdown import DropDown
  from kivy.uix.button import Button
  
  class FileDropDown(DropDown):
      def new(self):
          print('New')
  
      def open_file(self):
          print('Open')
  
      def save(self):
          print('Save')
  
      def save_as(self):
          print('Save As')
  
  class NotesDropDown(DropDown):
      def judges(self):
          print('Judges')
  
      def clubs(self):
          print('Clubs')
  
      def locations(self):
          print('Locations')
  
  class AgilityApp(App):
      def build(self):
          root_widget = StackLayout(orientation='lr-tb')
  
          fdd = FileDropDown()
          fbutton = Button(text='File', size_hint=(None, None),
              size=(60,35))
          fbutton.bind(on_release=fdd.open)
          root_widget.add_widget(fbutton)
  
          ndd = NotesDropDown()
          nbutton = Button(text='Notes', size_hint=(None, None),
              size=(80,35))
          nbutton.bind(on_release=ndd.open)
          root_widget.add_widget(nbutton)
  
          return root_widget
  
  AgilityApp().run()
  </code></pre>
  <p>and the kv file is</p>
  <pre><code>&lt;FileDropDown&gt;:
      Button:
          id: new
          text: 'New'
          size_hint_y: None
          height: 35
          on_release: root.new()
      Button:
          id: open
          text: 'Open'
          size_hint_y: None
          height: 35
          on_release: root.open_file()
      Button:
          id: save
          text: 'Save'
          size_hint_y: None
          height: 35
          on_release: root.save()
      Button:
          id: save_as
          text: 'Save As'
          size_hint_y: None
          height: 35
          on_release: root.save_as()
  
  &lt;NotesDropDown&gt;:
      Button:
          id: judges
          text: 'Judges'
          size_hint_y: None
          height: 35
          on_release: root.judges()
      Button:
          id: clubs
          text: 'Clubs'
          size_hint_y: None
          height: 35
          on_release: root.clubs()
      Button:
          id: locations
          text: 'Locations'
          size_hint_y: None
          height: 35
          on_release: root.locations()
  </code></pre>
  <p>I have tried moving the <code>NotesDropDown</code> further away from the <code>FileDropDown</code>, widening it, changing layouts to <code>BoxLayout</code>, <code>GridLayout</code>, and a few others all with no success.</p>
  <p>I will say that I can get to work just fine in Tkinter but was hoping to use kivy so that I can make it into a mobile application also.</p>
  <p>Thank you in advance!</p>