opengl_init (GTK_DRAWING_AREA(drawing), GTK_NOTEBOOK(tab_area));
ridge_init (GTK_DRAWING_AREA(drawing), GTK_NOTEBOOK(tab_area));
radar_init (GTK_DRAWING_AREA(drawing), GTK_NOTEBOOK(tab_area));
opengl_init (GTK_DRAWING_AREA(drawing), GTK_NOTEBOOK(tab_area));
ridge_init (GTK_DRAWING_AREA(drawing), GTK_NOTEBOOK(tab_area));
radar_init (GTK_DRAWING_AREA(drawing), GTK_NOTEBOOK(tab_area));