code: def fn_clicked(self, func):
      self._fn_clicked = func
      self._corner.Bind(wx.EVT_BUTTON, self._fn_clicked)
  
imports: import wx
  import wx.lib.mixins.gridlabelrenderer
  from cellprofiler.icons import get_builtin_image
label_desc: Use image node_id 3 for calling the CornerLabelRenderer obj's underlying member method code with example usage: obj.fn_clicked(func) without return types