BokehJS TileRendererView

Hello, I have extended TileRenderer like this:

export var MyTileRenderer = (function() {
  class MyTileRenderer extends TileRenderer {};
  MyTileRenderer.prototype.default_view = MyTileRendererView;
  MyTileRenderer.__name__ = 'MyTileRenderer';
  return MyTileRenderer;
}).call(this);

Which works great… however I need to be able to access the instance of the MyTileRendererView because I need to access the property called map_frame.bbox on the TileRendererView which is running when the tile plot has already been rendered…and I simply cannot find a way to do this.

Can anyone help me understand how I can gain access to the renderer view ?