def popup(self, title, callfn, initialdir=None, filename=None):
        self.cb = callfn
        self.filew.set_title(title)
        if initialdir:
            self.filew.set_current_folder(initialdir)

        if filename:
            #self.filew.set_filename(filename)
            self.filew.set_current_name(filename)

        self.filew.show()

    # Get the selected filename
Resets all mutex implementation registrations.
dataset/ETHPy150Open ejeschke/ginga/ginga/gtkw/GtkHelp.py/FileSelection.popup--crossover with--dataset/ETHPy150Open pantsbuild/pants/src/python/pants/task/mutex_task_mixin.py/MutexTaskMixin.reset_implementations