controller.kv

#:kivy 1.0

<Controller>:
    GridLayout:
        id: maingrid
        cols: 2
        padding: 1
#        row_default_height: 40
#        row_force_default: True
        GridLayout:
            id: arrivals
            cols: 1
            HeaderButton:
                on_press: root.do_add_click(1)
                background_color: 0,.5,0,1
                id: title_0
            MyScrollView:
                size_hint_y: 10
                id: scroll_0

        GridLayout:
            cols: 1
            HeaderButton:
                on_press: root.do_add_click(0)
                background_color: 1,.3,.3,1
                id: title_1
            MyScrollView:
                size_hint_y: 10
                id: scroll_1

        GridLayout:
            cols: 1
            HeaderButton:
                on_press: root.do_add_click(2)
                background_color: .3,.3,1,1
                id: title_2
            MyScrollView:
                size_hint_y: 10
                id: scroll_2

        GridLayout:
            cols: 1
            HeaderButton:
                background_color: .3,.3,1,1
                id: title_3
            MyScrollView:
                size_hint_y: 10
                id: scroll_3

<HeaderButton@Button>:
    width:300
    #disabled: True
    size_hint_y: 1
    background_normal: ''
    disabled_color: 1, 1, 1, 1
    background_disabled_normal: self.background_normal



<MyScrollView@ScrollView>:
    bar_width: 20
    id: sv
	GridLayout:
        id: grid
        cols: 1
        size_hint_y: None
        height: self.minimum_height
        padding: 5
        spacing: 5