text: from kivy.lang.builder import Builder
  from kivy.uix.screenmanager import Screen
  from kivymd.uix.list import OneLineListItem
  
  Builder.load_string(
      """
  <SilverAppbar>:
      name: 'SilverAppbar'
  
      AKSilverAppbar:
          max_height: dp(300)
          title: root.name
          left_action_items:[['arrow-left' , lambda x:app.show_screen('Home','back') ]]
          pin_top: True
          hide_toolbar: True  
          radius: dp(20)
          toolbar_bg: app.theme_cls.primary_color
          
          AKSilverAppbarHeader:     
              orientation: 'vertical'     
              Image:
                  source: 'assets/fly.jpg'
                  allow_stretch: True 
                  keep_ratio: False
  
          AKSilverAppbarContent:
              padding: dp(10)
              id: content
              size_hint_y: None 
              height: self.minimum_height
              orientation: 'vertical'
              md_bg_color: app.theme_cls.primary_color
  
  """
  )
  
  class SilverAppbar(Screen):
  
      def on_enter(self, *args):
          
          for x in range(30):
              self.ids.content.add_widget(OneLineListItem(text='Item %d'%x))
  
      def on_leave(self, *args):
          self.ids.content.clear_widgets()
  