title: Python (Kivy) - How to resize tabs of a TabbedPanel
body: <p>I'm using the <code>Kivy</code> library for the first time and I'm trying to develop a simple UI with a <code>TabbedPanel</code>. I would set the size (<code>x</code>) of each tab (in the code <code>TabbedPanelItem</code>) to fit at the entire <code>TabbedPanel</code>'s width but if I use <code>height</code> or <code>size_hint</code> in the <code>.kv</code> file, seems they doesn't work.</p>
  
  <p>Here my kv code:</p>
  
  <pre><code>#:import sm kivy.uix.screenmanager
  ScreenManagement:
      transition: sm.FadeTransition()
      SecondScreen:
  
  
  &lt;SecondScreen&gt;:
      tabba: tabba
      name: 'second'
      FloatLayout:
          background_color: (255, 255, 255, 1.0)
          BoxLayout:
              orientation: 'vertical'
              size_hint: 1, 0.10
              pos_hint: {'top': 1.0}
              canvas:
                  Color:
                      rgba: (0.98, 0.4, 0, 1.0)
                  Rectangle:
                      pos: self.pos
                      size: self.size
              Label:
                  text: 'MyApp'
                  font_size: 30
                  size: self.texture_size
  
          BoxLayout:
              orientation: 'vertical'
              size_hint: 1, 0.90
              Tabba:
                  id: tabba
  
          BoxLayout:
              orientation: 'vertical'
              size_hint: 1, 0.10
              pos_hint: {'bottom': 1.0}
              Button:
                  background_color: (80, 1, 0, 1.0)
                  text: 'Do nop'
                  font_size: 25
  
  
  &lt;Tabba&gt;:
      do_default_tab: False
      background_color: (255, 255, 255, 1.0)
      # I would these three tabs' width filling the entire TabbedPanel's width
      TabbedPanelItem:
          text: 'First_Tab'
          Tabs:
  
      TabbedPanelItem:
          text: 'Second_Tab'
          Tabs:
  
      TabbedPanelItem:
          text: 'Third_Tab'
          Tabs:
  
  
  &lt;Tabs&gt;:
      grid: grid
      ScrollView:
          do_scroll_y: True
          do_scroll_x: False
          size_hint: (1, None)
          height: root.height
          GridLayout:
              id: grid
              cols: 1
              spacing: 10
              padding: 10
              size_hint_y: None
              height: 2500
  </code></pre>
  
  <p>Here my Python code:</p>
  
  <pre><code># coding=utf-8
  __author__ = 'drakenden'
  
  __version__ = '0.1'
  
  import kivy
  kivy.require('1.9.0') # replace with your current kivy version !
  
  from kivy.app import App
  from kivy.lang import Builder
  from kivy.uix.screenmanager import ScreenManager, Screen, FadeTransition
  from kivy.properties import StringProperty, ObjectProperty,NumericProperty
  from kivy.uix.tabbedpanel import TabbedPanel
  from kivy.uix.boxlayout import BoxLayout
  from kivy.uix.button import Button
  from kivy.utils import platform
  from kivy.uix.gridlayout import GridLayout
  from kivy.uix.label import Label
  from kivy.uix.scrollview import ScrollView
  
  class Tabs(ScrollView):
      def __init__(self, **kwargs):
          super(Tabs, self).__init__(**kwargs)
  
  
  class Tabba(TabbedPanel):
      pass
  
  
  class SecondScreen(Screen):
      pass
  
  class ScreenManagement(ScreenManager):
      pass
  
  presentation = Builder.load_file("layout2.kv")
  
  class MyApp(App):
  
      def build(self):
          return presentation
  
  
  MyApp().run()
  </code></pre>
  
  <p>I've read about using a <code>StripLayout</code> inside the <code>TabbedPanel</code> but I don't know if is a good solution and how to apply it correctly. Any suggestions?  </p>