docstr: Start the Tk.mainloop. This will block until all Tk windows are destroyed.
code: def _vispy_run(self):
      """Start the Tk.mainloop. This will block until all Tk windows are destroyed."""
      self._vispy_get_native_app().mainloop()
  
imports: from __future__ import division
  from time import sleep
  import warnings
  from ..base import BaseApplicationBackend, BaseCanvasBackend, BaseTimerBackend
  from ...util import keys
  from ...util.ptime import time
  from ...gloo import gl
label_desc: Use image node_id 3 for calling the ApplicationBackend obj's underlying member method code with example usage: obj._vispy_run() without return types