+ g_signal_connect((gpointer) radiobutton_linea, "toggled",
+ G_CALLBACK (on_radiobutton_linea_toggled),
+ NULL);
+ g_signal_connect((gpointer) radiobutton_cuadrado, "toggled",
+ G_CALLBACK (on_radiobutton_cuadrado_toggled),
+ NULL);
+ g_signal_connect((gpointer) radiobutton_rectangulo, "toggled",
+ G_CALLBACK (on_radiobutton_rectangulo_toggled),
+ NULL);
+ g_signal_connect((gpointer) radiobutton_circulo, "toggled",
+ G_CALLBACK (on_radiobutton_circulo_toggled),
+ NULL);