add dynamically

# .py Code:

class RcGUIApp(App):
        def build(self):
                Window.clearcolor = (0, 0, 0.35, 1)
                sm = ScreenManager()
                sm.add_widget(IntroPage(name="intro_page"))
                sm.add_widget(NewJobPage(name="new_job_page"))
                sm.add_widget(IPMConfirmPage(name = "ipm_confirm_page"))
                return sm

class IntroPage(Screen):

        def  returnCDPath(self):
                global rc
                return str(rc.cd_path)

        def locateDatabase(self):
                global rc
                self.data_label.text = rc.retrieveDatabase()

        def openJob(self):
                #Go to open job page
                pass

class NewJobPage(Screen):


        def newJob(self):
                global rc
                self.ipm_label.text = "IPM file path: " + str(rc.openIPM())
                rc.makePartList()
                rc.makePoleList()

        def  returnCDPath(self):
                global rc
                return str(rc.cd_path)

        def locateDatabase(self):
                global rc
                self.data_label.text = rc.retrieveDatabase()

        def retrieve(self):
                global rc
                rc.getIPM(self.ipm_header.text.upper())
                rc.buildIPM(self.pole_header.text.upper(), self.cd_header.text.upper(), self.conductor_header.text.upper())
                IPMConfirmPage().displayIPM()

class OpenJobPage(Screen):
        pass


class IPMConfirmPage(Screen):
        def displayIPM(self):
                for i in range(25):
                        self.grid.add_widget(Button(text="you did it!"))

#.kv Code:

<IntroPage>:

        data_label: database_label

        BoxLayout:

                orientation: "vertical"
                padding: 10
                spacing: 10

                BoxLayout:

                        orientation: "horizontal"
                        size_hint: (1, .10)

                        Button:
                                text: "Locate Database"
                                color: (1,1,1,1)
                                on_press:
                                        root.locateDatabase()
                                        root.data_label.color= (0,1,0,1)
                                size_hint_x: (0.05)

                        Label:
                                id: database_label
                                text: root.returnCDPath()
                                color: (1,0,0,1)
                                size_hint_x: (0.2)
                                pos: (.5, .5)



                BoxLayout:
                        orientation: "horizontal"

                        Button:
                                text: "NEW JOB"
                                color: (1,1,1,1)
                                size_hint: (.45, .10)
                                on_press:
                                        root.manager.transition.direction = "up"
                                        root.manager.transition.duration = .8
                                        root.manager.current = "new_job_page"
                        Button:
                                text: "OPEN JOB"
                                color: (1,1,1,1)
                                size_hint: (.45, .10)
                                pos: (0.5, 0.5)
                                on_press: root.openJob()

<NewJobPage>:

        data_label: database_label
        ipm_label: ipm_name_label
        pole_header: pole_col
        cd_header: cd_col
        conductor_header: conductor_col
        ipm_header: ipm_col

        BoxLayout:

                orientation: "vertical"
                padding: 10
                spacing: 10

                BoxLayout:

                        orientation: "horizontal"
                        size_hint: (1, .10)

                        Button:
                                text: "Locate Database"
                                color: (1,1,1,1)
                                on_press:
                                        root.locateDatabase()
                                        root.data_label.color= (0,1,0,1)
                                size_hint_x: (0.05)

                        Label:
                                id: database_label
                                text: root.returnCDPath()
                                color: (1,0,0,1)
                                size_hint_x: (0.2)
                                pos: (.5, .5)
                BoxLayout:

                        orientation: "horizontal"
                        size_hint: (1, .20)

                        Button:
                                text: "Load IPM"
                                color: (1,1,1,1)
                                size_hint: (.05, 0.5)
                                on_press:
                                        root.newJob()

                        Label:
                                id: ipm_name_label
                                text: ""
                                size_hint: (.2, 0.5)

                BoxLayout:

                        orientation: "vertical"
                        size_hint: (1, .35)

                        Label:
                                text: "Enter your Pole, CD# and Conductor column names below:"
                                pos_hint: {' center_x': 0.5, 'bottom': 1}

                        BoxLayout:
                                orientation: "horizontal"
                                spacing: 30
                                size_hint: (1, 0.35)

                                TextInput:
                                        id: ipm_col
                                        text: "IPM"

                                TextInput:
                                        id: pole_col
                                        text: "POLE"

                                TextInput:
                                        id: cd_col
                                        text: "CD#"

                                TextInput:
                                        id: conductor_col
                                        text: "CONDUCTOR"

                BoxLayout:
                        orientation: "horizontal"
                        size_hint: (1, .35)

                        Button:
                                text: "RETRIEVE"
                                pos_hint: {"center_x": .5, "center_y": .5}
                                size_hint: (.33, .33)
                                color: (1,1,1,1)
                                on_press:
                                        root.retrieve()
                                        root.manager.transition.direction = "left"
                                        root.manager.transition.duration = .8
                                        root.manager.current = "ipm_confirm_page"

<IPMConfirmPage>:
        grid: Grid
        GridLayout:
                cols: 1
                size_hint_x: 1
                padding: 10
                spacing: 10

                BoxLayout:

                        size_hint: (1, 0.1)

                        Label:
                                text: "IPM"
                        Label:
                                text: "CD#"
                        Label:
                                text: "CONDUCTOR"

                ScrollView:

                        GridLayout:
                                id: Grid
                                cols: 3
                                height: self.minimum_height
                                size_hint: 1, None
                                spacing: 50
                                padding: 10