public void on_start_editing_figure(
Figure figure, bool change_connections = false
)
{
this.change_connections = change_connections;
activate();
built_figure = figure;
built_repr = figure.get_representations().FirstOrDefault() as Figure_representation;
figure_header = built_figure.header;
figure_header.start_building();
figure_observer.observe(built_figure);
if (built_repr)
{
connect_subfigures_to_builder(built_figure);
}
}