__init__ (
        self,
        dialog,
        frame,
        row,
        show_headings,
        cparams,
        cheading,
        histogram_height,
        hidable,
        )

color_changed_cb ( self,  rgba )

freeze_canvas_size ( self,  hwidth )

make_headings_on_top (
        self,
        frame,
        row,
        cheading,
        hidable,
        )

make_histogram (
        self,
        frame,
        row,
        histogram_height,
        )

plot_solid_levels ( self )

plot_surface_levels ( self )

selected_histogram_marker ( self )

set_component_parameters_from_gui ( self )

set_default_thresholds ( self )

set_threshold_and_color_widgets ( self,  invoke_callbacks=1 )

solid_mode ( self,  solid )

threshold_entry_enter_cb ( self,  event )

update_component_gui (
        self,
        data_region,
        message_cb,
        )

update_histogram (
        self,
        data_region,
        read_matrix,
        message_cb,
        )