What's wrong with my actions???

[fullmetalcoder]

In a custom tree model I have enabled context menu handling at node level and the code looks like that :

pMenu = new QMenu("Actions");
    setupMenu(pMenu);
 
    QAction *a = pMenu->exec(p);
 
    qDebug("action triggered : %s", a ? qPrintable(a->text()) : "");
    //pMenu->deleteLater();
 
    if ( a )
        a->trigger();

pMenu = new QMenu("Actions");
    setupMenu(pMenu);
    
    QAction *a = pMenu->exec(p);
    
    qDebug("action triggered : %s", a ? qPrintable(a->text()) : "");
    //pMenu->deleteLater();
    
    if ( a )
        a->trigger();

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setupMenu() is a virtual function that is in charge of setting up the menu content :

QAction *a;
 
    a = new QAction(QIcon(":/"), tr("&Remove"), m);
    connect(a    , SIGNAL( triggered() ),
            this, SLOT  ( deleteLater() ) );
 
    m->addAction(a);
 
    m->addSeparator();
 
    a = new QAction(QIcon(":/folder.png"), tr("A&dd folder"), m);
    connect(a    , SIGNAL( triggered() ),
            this, SLOT  ( addFolder() ) );
 
    m->addAction(a);
 
    a = new QAction(QIcon(":/add.png"), tr("Add &file"), m);
    connect(a    , SIGNAL( triggered() ),
            this, SLOT  ( addFile() ) );
 
    m->addAction(a);
 
    a = new QAction(QIcon(":/file.png"), tr("&New file"), m);
    connect(a    , SIGNAL( triggered() ),
            this, SLOT  ( newFile() ) );
 
    m->addAction(a);
 
    m->addSeparator();
 
    a = new QAction(QIcon(":/clear.png"), tr("&Clear"), m);
    connect(a    , SIGNAL( triggered() ),
            this, SLOT  ( clear() ) );
 
    m->addAction(a);

QAction *a;
    
    a = new QAction(QIcon(":/"), tr("&Remove"), m);
    connect(a    , SIGNAL( triggered() ),
            this, SLOT  ( deleteLater() ) );
    
    m->addAction(a);
    
    m->addSeparator();
    
    a = new QAction(QIcon(":/folder.png"), tr("A&dd folder"), m);
    connect(a    , SIGNAL( triggered() ),
            this, SLOT  ( addFolder() ) );
    
    m->addAction(a);
    
    a = new QAction(QIcon(":/add.png"), tr("Add &file"), m);
    connect(a    , SIGNAL( triggered() ),
            this, SLOT  ( addFile() ) );
    
    m->addAction(a);
    
    a = new QAction(QIcon(":/file.png"), tr("&New file"), m);
    connect(a    , SIGNAL( triggered() ),
            this, SLOT  ( newFile() ) );
    
    m->addAction(a);
    
    m->addSeparator();
    
    a = new QAction(QIcon(":/clear.png"), tr("&Clear"), m);
    connect(a    , SIGNAL( triggered() ),
            this, SLOT  ( clear() ) );
    
    m->addAction(a);

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When I play with my model on a QTreeView the context menu gets displayed correctly. Then if I trigger an action by clicking on a menu item I get a correct message on the console output ( i.e : "action triggered : x") but the triggered signal is never emitted (or never forwarded to the slots I have connected to it even when I call trigger() programmatically ...

I'm using Qt 4.2.2 under Linux. Any hints???