State Transition when Mouse Enters Object Problem

I'm having a problem on transitioning between states, by hovering on the object.

I have tried this code

Code:

QStateMachine machine;
    machine.setGlobalRestorePolicy(QStateMachine::RestoreProperties);
 
    QState *group = new QState(&machine);
    group->setObjectName("group");
 
    QRect selectedRect(270, 125, 130, 130);
 
    QState *idleState = new QState(group);
    group->setInitialState(idleState);
 
    QObjectList objects;
    objects << p1 << p2 << p3;
 
    QState *state1 = new QState(group);
    QState *state2 = new QState(group);
    QState *state3 = new QState(group);
 
    state1->assignProperty(p1, "geometry", selectedRect);
    state2->assignProperty(p2, "geometry", selectedRect);
    state3->assignProperty(p3, "geometry", selectedRect);
 
    // Enter P1
            QEventTransition *enterTransition = new QEventTransition(p1, QEvent::Enter);
            enterTransition->setTargetState(state1);
            group->addTransition(enterTransition);
 
    // Enter P2
            QEventTransition *enterTransition = new QEventTransition(p2, QEvent::Enter);
            enterTransition->setTargetState(state2);
            group->addTransition(enterTransition);
 
    // Enter P2
            QEventTransition *enterTransition = new QEventTransition(p3, QEvent::Enter);
            enterTransition->setTargetState(state3);
            group->addTransition(enterTransition);
 
    window.createAnimations(objects, &machine);
 
    machine.addState(s1);
    machine.addState(s2);
    machine.addState(s3);
    machine.setInitialState(group);
    machine.start();

It works fine if I try to trigger the transition with a mouse click,

Code:

group->addTransition(p1, SIGNAL(clicked()), state1);

So I think I'm doing something wrong with the QEventTransition,
but I have no idea what I'm doing wrong.

Thanks.