Kivy - My ScrollView doesn't scroll
Question: I'm having problems in my Python application with Kivy library. In particular
I'm trying to create a scrollable list of elements in a TabbedPanelItem, but I
don't know why my list doesn't scroll.

Here is my kv file:

    
    
    #:import sm kivy.uix.screenmanager
    ScreenManagement:
         transition: sm.FadeTransition()
         SecondScreen:
    
    <SecondScreen>:
        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
    
    
    <Tabba>:
        do_default_tab: False
        background_color: (255, 255, 255, 1.0)
    
        TabbedPanelItem:
            text: 'First_Tab'
            Tabs:
    
        TabbedPanelItem:
            text: 'Second_Tab'
            Tabs:
    
        TabbedPanelItem:
            text: 'Third_Tab'
            Tabs:
    
    
    <Tabs>:
        grid: grid
        ScrollView:
            scroll_timeout: 250
            scroll_distance: 20
            do_scroll_y: True
            do_scroll_x: False
            GridLayout:
                id: grid
                cols: 1
                spacing: 10
                padding: 10
                Label:
                    text:'scroll'
                    color: (0, 0, 0, 1.0)
                Label:
                    text:'scroll'
                    color: (0, 0, 0, 1.0)
            Label:
                text:'scroll'
                color: (0, 0, 0, 1.0)
            Label:
                text:'scroll'
                color: (0, 0, 0, 1.0)
            Label:
                text:'scroll'
                color: (0, 0, 0, 1.0)
            Label:
                text:'scroll'
                color: (0, 0, 0, 1.0)
            Label:
                text:'scroll'
                color: (0, 0, 0, 1.0)
            Label:
                text:'scroll'
                color: (0, 0, 0, 1.0)
            Label:
                text:'scroll'
                color: (0, 0, 0, 1.0)
            Label:
                text:'scroll'
                color: (0, 0, 0, 1.0)
            Label:
                text:'scroll'
                color: (0, 0, 0, 1.0)
            Label:
                text:'scroll'
                color: (0, 0, 0, 1.0)
            Label:
                text:'scroll'
                color: (0, 0, 0, 1.0)
            Label:
                text:'scroll'
                color: (0, 0, 0, 1.0)
            Label:
                text:'scroll'
                color: (0, 0, 0, 1.0)
            Label:
                text:'scroll'
                color: (0, 0, 0, 1.0)
            Label:
                text:'scroll'
                color: (0, 0, 0, 1.0)
            Label:
                text:'scroll'
                color: (0, 0, 0, 1.0)
            Label:
                text:'scroll'
                color: (0, 0, 0, 1.0)
            Label:
                text:'scroll'
                color: (0, 0, 0, 1.0)
            Label:
                text:'scroll'
                color: (0, 0, 0, 1.0)
            Label:
                text:'scroll'
                color: (0, 0, 0, 1.0)
            Label:
                text:'scroll'
                color: (0, 0, 0, 1.0)
            Label:
                text:'scroll'
                color: (0, 0, 0, 1.0)
            Label:
                text:'scroll'
                color: (0, 0, 0, 1.0)
    

And here my .py code:

    
    
    __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()
    

Where/What am I doing wrong?

(Comments and suggests for UI improvements are also accepted)


Answer: I Myself haven't used kivy for a while but if I remember exacly: Because
layout within ScrollView should be BIGGER than scroll view ex ScrollView
width: 1000px, GridView 1100px. So it will be possible to scroll it by 100px

