The following code (pseudo) will swith to console 1.
...
PhWindowEvent_t ev;
...
    ev.event_f = Ph_WM_CONSWITCH;
    ev.rid = PtWidgetRid(widget);
    ev.input_group = 1;
    ev.event_state = 0;
     ev.pos.x = 0;
    ev.pos.y = 0;
    PtForwardWindowEvent( &ev );
...