def do_layout(self, size=None, force=False):
""" Tells this frame to do layout at a given size.
Overrides PlotComponent. If this frame needs to fit components in at
least one dimension, then it checks whether any of them need to do
layout; if so, the frame needs to do layout also.
"""
if not self._layout_needed and not force and self.fit_components != "":
for slot in self._frame_slots.values():
if slot._layout_needed:
self._layout_needed = True
break
return PlotComponent.do_layout(self, size, force)
