KivyMD - How can i use MDCheckbox on_active to remove the parent List Item containing the checkbox?

I have an MDList containing various ThreeLineAvatarIconListItem widgets. These list items contain an MDCheckbox as the right icon. The functionality I would like to implement - when the Checkbox is ticked i.e. 'on_active', the parent list item is completely removed. The list is a Task Tracker and the idea is that the task can be 'ticked' and is then no longer displayed within the list.

Some (possibly not-so!)relevant code extracts:

class TasksScreen(Screen) :
def on_enter(self, *args):
    for i in TaskStore.keys() :
        self.ids.wiki_cardcontainer.add_widget(TaskItems(id='wikitask {}'.format('task_title'),
                                                         text=str(TaskStore.get(i)['task_title']),
                                                         secondary_text=str(TaskStore.get(i)['task_detail']),
                                                         tertiary_text=str(TaskStore.get(i)['task_deadline'])))

def on_leave(self, *args):
    self.ids.wiki_cardcontainer.clear_widgets()



def get_date(self, date) :
    '''
    :type date: <class 'datetime.date'>
    '''
    self.ids.wiki_dateselected.text = str(date)

def show_date_picker(self) :
    date_dialog = MDDatePicker(callback=self.get_date)
    date_dialog.open()

def create_task(self):
    task_title = self.ids.i_wiki_tasktitle.text
    task_detail = self.ids.i_wiki_taskdetail.text
    task_deadline = self.ids.wiki_dateselected.text
    print('Task title is {}, task detail is {}, and task deadline is {}'.format(task_title, task_detail, task_deadline))
    self.ids.wiki_cardcontainer.add_widget(TaskItems(id = 'wikitask_{}'.format(task_title),
                                                                 text=str(task_title),
                                                                 secondary_text = str(task_detail),
                                                                 tertiary_text = str(task_deadline)))
    TaskStore[str(task_title)] = {'task_title': str(task_title), 'task_detail': str(task_detail), 'task_deadline': str(task_deadline)}

TaskStore = JsonStore("TaskStore.json")


class TaskItems(ThreeLineAvatarIconListItem):

    def complete_task(self):
        print('widget removed')
        #TODO Add in functionality to remove widget when checkbox is ticked.
    pass

class Container(IRightBodyTouch, MDBoxLayout):
    adaptive_width = True

class RightCheckBox(IRightBodyTouch, MDCheckbox):
    pass

.kv

: name: 'TasksScreen'

MDBoxLayout:
    orientation: 'horizontal'
    size_hint_y: 1
    size_hint_x: 1

    MDBoxLayout:
        size_hint: (0.4, 1)
        orientation: 'vertical'

        MDCard:
            id: wiki_card_1
            orientation: 'vertical'
            size_hint: (1, 1)
            spacing: 5
            MDLabel:
                size_hint: (1, None)
                text: 'Task Entry'
                text_size: self.size
                font_size: 40
                halign: 'left'
                pos_hint: {'top': 1}
                md_bg_color: app.theme_cls.accent_light
                elevation: 10

            MDLabel:
                size_hint: (1, None)
                text: 'Task Details'
                font_size: 15
                halign: 'left'
                pos_hint: {'top': 1}

            MDTextField:
                id: i_wiki_tasktitle
                size_hint: (0.8, None)
                pos_hint: {'top': 1}
                hint_text: "Enter task title: "
                mode: "rectangle"
                multiline: False
                required: True
                color_mode: 'accent'
                icon_right: "arrow-down-drop-circle-outline"
                icon_right_color: app.theme_cls.accent_color

            MDTextField:
                id: i_wiki_taskdetail
                size_hint: (0.8, None)
                hint_text: "Details of task: (max 200 chars.)"
                mode: "rectangle"
                multiline: True
                max_text_length: 200
                color_mode: 'accent'
                icon_right: "arrow-down-drop-circle-outline"
                icon_right_color: app.theme_cls.accent_color

            MDBoxLayout:
                orientation: 'horizontal'
                size_hint: (1, None)
                height: self.minimum_height
                width: root.ids.wiki_card_1.width
                spacing: '20dp'

                MDRaisedButton:
                    text: 'Select Deadline'
                    size_hint: (None, None)
                    halign: 'left'
                    height: '40dp'
                    md_bg_color: app.theme_cls.accent_light
                    on_release: root.show_date_picker()

                MDLabel:
                    text: '[select date]'
                    id: wiki_dateselected
                    icon: 'calendar'
                    size_hint: (None, None)
                    height: '40dp'
                    width: '200dp'


                MDLabel:
                    text: ''
                    size_hint_x: '0.4'


            MDRaisedButton:
                text: 'Submit'
                md_bg_color: app.theme_cls.accent_light
                on_release: root.create_task()

            MDLabel:
                text: ''


    ScrollView:
        size_hint: (0.6, 1)
        MDList:
            id: wiki_cardcontainer


<TaskItems>
    IconLeftWidget:
        icon: 'star'

    RightCheckBox:
        on_active:
            root.complete_task()