Ok, thank you for fast answer.
I add actions to group like it:
gtk_action_group_add_actions (group, entries. number_entries, (gpointer) data_to_cb);
I try to transfer pointer on vbox from main function to callback function, but when i try to add widget to vbox with
gtk_box_pack_start(GTK_BOX(vbox), widget_to_pack, TRUE, TRUE, 0);
it did't added, that is, no change occurs. I tried to send from the main function pointer to a label and change it, then to the callback function and it's going well. Is there any way in callback function to add widgets into the vbox?