code: def add_tk_widget(self, tk_widget, grid=None, align=None, visible=True, enabled=None, width=None, height=None):
          
          return Widget(self, tk_widget, "tk widget", grid, align, visible, enabled, width, height)
docs: Adds a tk widget into a guizero container.
  
          :param tkinter.Widget tk_widget:
              The Container (App, Box, etc) the tk widget will belong too.
  
          :param List grid:
              Grid co-ordinates for the widget, required if the master layout
              is 'grid', defaults to `None`.
  
          :param string align:
              How to align the widget within the grid, defaults to None.
  
          :param bool visible:
              If the widget should be visible, defaults to `True`.
  
          :param bool enabled:
              If the widget should be enabled, defaults to `None`. If `None`
              the value is inherited from the master.
  
          :param int width:
              The starting width of the widget. Defaults to `None` and will auto
              size.
  
          :param int height:
              The starting height of the widget. Defaults to `None` and will auto
              size.