For evaluating event propagation: Test of FloatLayout with 4 ScrollViews added to it.

scrollview.py

import kivy
kivy.require('1.0.8')

from kivy.app import App
from kivy.uix.scrollview import ScrollView
from kivy.uix.stacklayout import StackLayout
from kivy.uix.label import Label
from kivy.lang import Builder
from kivy.uix.floatlayout import FloatLayout

Builder.load_file('scrollview.kv')

class MyFloatLayout(FloatLayout):

    def __init__(self, name, *args, **kwargs):
        super(MyFloatLayout, self).__init__(*args, **kwargs)
        self.name = name

    # TESTPOINT FLOAT
    # def on_touch_down(self, touch):
        # super(MyFloatLayout, self).on_touch_down(touch)
        # print "MyFloatLayout: touched!", self.name

class MyLabel(Label):
    def __init__(self, *args, **kwargs):
        super(MyLabel, self).__init__(*args, **kwargs)

    # TESTPOINT LABEL
    def on_touch_down(self,touch):
        print "MyLabel: touched!", self.text

class MyScrollView(ScrollView):

    def __init__(self, name, *args, **kwargs):
        super(MyScrollView, self).__init__(*args, **kwargs)
        self.name = name

    # TESTPOINT SCROLL
    # def on_touch_down(self, touch):
        # super(MyScrollView, self).on_touch_down(touch)
        # print "MyScrollView: touched!", self.name
        # return True

class MyStackLayout(StackLayout):

    def __init__(self, name, *args, **kwargs):
        super(MyStackLayout, self).__init__(*args, **kwargs)
        self.name = name

    # TESTPOINT STACK
    # def on_touch_down(self, touch):
        # super(MyStackLayout, self).on_touch_down(touch)
        # print "MyStackLayout: touched!", self.name


class ScrollViewApp(App):

    def build(self):
        root = MyFloatLayout("root")
        for j in [[1,1], [2,1], [1,2], [2,2]]:
            # create a default grid layout with custom width/height. Find the specs in the .kv file
            mystacklayout = MyStackLayout(str(j))

            # when we add children to the grid layout, its size doesn't change at
            # all. we need to ensure that the height will be the minimum required to
            # contain all the childs. (otherwise, we'll child outside the bounding
            # box of the view)
            mystacklayout.bind(minimum_height=mystacklayout.setter('height'))

            label_group = str(j)
            # add button into that grid
            for i in range(5):
                a_label = MyLabel(text=label_group + "_lbl: " + str(i))
                mystacklayout.add_widget(a_label)
            # create a scroll view, with a size < size of the grid
            x = float(j[0])**2 * 80
            y = float(j[1])**2 * 80
            myscrollview = MyScrollView(str(j), pos=(x,y)) # Specs also in the .kv
            myscrollview.add_widget(mystacklayout)

            root.add_widget(myscrollview)

        odd_label = MyLabel(text="Oddball")
        root.add_widget(odd_label)
        return root

if __name__ == '__main__':

    ScrollViewApp().run()