How to use the asciimatics.widgets.Button function in asciimatics

("Item 3", 10),
			 ("Item 3", 11),
			 ("Item 3", 12),
			 ("Item 3", 13),
			 ("Item 3", 14),
			 ("Item 3", 15),
			 ("Item 3", 16),
			 ("Item 4", 17),
			 ("Item 5", 18), ],
			label="Dropdown", name="DD", on_change=self._on_change), 1)
		self.layout.add_widget(Divider(height=3), 1)

		layout2 = Layout([1, 1, 1])
		self.add_layout(layout2)
		layout2.add_widget(self._reset_button, 0)
		layout2.add_widget(Button("View Data", self._view), 1)
		layout2.add_widget(Button("Quit", self._quit), 2)

		self.fix()

name="Things",
                                       on_change=self._on_change), 1)
        layout.add_widget(CheckBox("Field 1",
                                   label="A very silly long name for fields:",
                                   name="CA",
                                   on_change=self._on_change), 1)
        layout.add_widget(
            CheckBox("Field 2", name="CB", on_change=self._on_change), 1)
        layout.add_widget(
            CheckBox("Field 3", name="CC", on_change=self._on_change), 1)
        layout.add_widget(Divider(height=3), 1)
        layout2 = Layout([1, 1, 1])
        self.add_layout(layout2)
        layout2.add_widget(self._reset_button, 0)
        layout2.add_widget(Button("View Data", self._view), 1)
        layout2.add_widget(Button("Quit", self._quit), 2)
        self.fix()

def __init__(self, screen, init_values):
        super(TestFrame2, self).__init__(screen,
                                         screen.height,
                                         screen.width,
                                         data={"selected": "None"},
                                         title="Test Frame 2")
        # Create the form for displaying the list of contacts.
        self._list_view = ListBox(
            Widget.FILL_FRAME,
            init_values,
            name="contacts",
            on_change=self._on_pick,
            on_select=self._on_select)
        self._edit_button = Button("Edit", self._edit)
        self._delete_button = Button("Delete", self._delete)
        layout = Layout([100], fill_frame=True)
        self.add_layout(layout)
        layout.add_widget(self._list_view)
        layout.add_widget(Divider(line_char="#"))
        layout2 = Layout([1, 1, 1, 1])
        self.add_layout(layout2)
        layout2.add_widget(Button("Add", self._add), 0)
        layout2.add_widget(self._edit_button, 1)
        layout2.add_widget(self._delete_button, 2)
        layout2.add_widget(Button("Quit", self._quit), 3)
        layout3 = Layout([100])
        self.add_layout(layout3)
        self._info_text = Text(label="Selected:", name="selected")
        self._info_text.disabled = True
        layout3.add_widget(self._info_text)

def _init_nav( self ):
		layout = Layout( [ 1, 1, 1, 1, 1 ] )	# columns that take up 30%, 10%, 10%, 10%, 30% of available width
		self.add_layout( layout )
		layout.add_widget( Button(	"Back", self._back ), 1 )
		layout.add_widget( VerticalDivider( ), 2 )
		layout.add_widget( Button(	"OK", self._accept ), 3 )

on_load=self._reload_list,
                                       hover_focus=True,
                                       can_scroll=False,
                                       title="Contact List")
        # Save off the model that accesses the contacts database.
        self._model = model

        # Create the form for displaying the list of contacts.
        self._list_view = ListBox(
            Widget.FILL_FRAME,
            model.get_summary(),
            name="contacts",
            add_scroll_bar=True,
            on_change=self._on_pick,
            on_select=self._edit)
        self._edit_button = Button("Edit", self._edit)
        self._delete_button = Button("Delete", self._delete)
        layout = Layout([100], fill_frame=True)
        self.add_layout(layout)
        layout.add_widget(self._list_view)
        layout.add_widget(Divider())
        layout2 = Layout([1, 1, 1, 1])
        self.add_layout(layout2)
        layout2.add_widget(Button("Add", self._add), 0)
        layout2.add_widget(self._edit_button, 1)
        layout2.add_widget(self._delete_button, 2)
        layout2.add_widget(Button("Quit", self._quit), 3)
        self.fix()
        self._on_pick()

h = len(menu_items)
        if x + w >= screen.width:
            x -= w - 1
        if y + h >= screen.height:
            y -= h - 1

        # Construct the Frame
        super(PopupMenu, self).__init__(
            screen, h, w, x=x, y=y, has_border=False, is_modal=True)

        # Build the widget to display the time selection.
        layout = Layout([1], fill_frame=True)
        self.add_layout(layout)
        for item in menu_items:
            func = partial(self._destroy, item[1])
            layout.add_widget(Button(item[0], func, add_box=False), 0)
        self.fix()

def add_button(self, ok_fn, text, layout=[100], layout_index=0, add_divider=True):
        _layout = Layout(layout)
        self.add_layout(_layout)
        _layout.add_widget(Button(text, ok_fn), layout_index)
        if add_divider:
            _layout.add_widget(Divider(draw_line=False))

label="A Longer Selection:",
                                       name="Things",
                                       on_change=self._on_change), 1)
        layout.add_widget(CheckBox("Field 1",
                                   label="A very silly long name for fields:",
                                   name="CA",
                                   on_change=self._on_change), 1)
        layout.add_widget(
            CheckBox("Field 2", name="CB", on_change=self._on_change), 1)
        layout.add_widget(
            CheckBox("Field 3", name="CC", on_change=self._on_change), 1)
        layout.add_widget(Divider(height=3), 1)
        layout2 = Layout([1, 1, 1])
        self.add_layout(layout2)
        layout2.add_widget(self._reset_button, 0)
        layout2.add_widget(Button("View Data", self._view), 1)
        layout2.add_widget(Button("Quit", self._quit), 2)
        self.fix()

def add_button_row(self, buttons, layout=[1, 1, 1, 1], add_divider=True):
        lyt = Layout(layout)
        self.add_layout(lyt)
        for b in buttons:
            lyt.add_widget(Button(b[0], b[1]), b[2])
        if add_divider:
            lyt.add_widget(Divider(draw_line=False))

def _init_nav( self ):
		layout = Layout( [ 1, 1, 1, 1, 1 ] )	# columns that take up 30%, 10%, 10%, 10%, 30% of available width
		self.add_layout( layout )
		layout.add_widget( Button(	"Back", self._back ), 1 )
		layout.add_widget( VerticalDivider( ), 2 )
		layout.add_widget( Button(	"OK", self._accept ), 3 )