Problem with virtual functions

[eekhoorn12]

I have changed my code some to make use of pointers, the previous problem is solved but I still have a problem.

I will try to explain the situation some more.

I have a treeview which I would like to populate. It is going to be a treeview with a headerbar en below that one level that describes a certain group with its own information and it has child items to have some other information.

To create this I tried to make one abstract class named AbstractPostItem, this class als functions as the root item of the treeview.

For the description items in the treeview I created PostHeaderItem which inherits AbstractPostItem and for the child items of PostHeaderItem I created PostDataItem which also inherits AbstractPostItem.

Now from a dialog I try to create a new PostHeaderItem with its children, for that I use the following code:

PostHeaderItem::PostHeaderItem(QStringList files, QString subject, QString group)
{
    foreach(QString i, files)
    {
        PostDataItem *newItem = new PostDataItem(i);
        newItem->setSubject(subject);
        newItem->setGroup(group);
        newItem->setParent(this);
        addItem(newItem);
    }
    setSubject(subject);
    setGroup(group);
}

PostHeaderItem::PostHeaderItem(QStringList files, QString subject, QString group)
{
    foreach(QString i, files)
    {
        PostDataItem *newItem = new PostDataItem(i);
        newItem->setSubject(subject);
        newItem->setGroup(group);
        newItem->setParent(this);
        addItem(newItem);
    }
    setSubject(subject);
    setGroup(group);
}

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Which is called from:

AbstractPostItem *NewPost::getPost()
{
    PostHeaderItem *newItem = new PostHeaderItem(files, ui->inputSubject->text(), ui->inputUsenetGroup->text());
    return newItem;
}

AbstractPostItem *NewPost::getPost()
{
    PostHeaderItem *newItem = new PostHeaderItem(files, ui->inputSubject->text(), ui->inputUsenetGroup->text());
    return newItem;
}

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Which is called from:

void PostView::newPost()
{
    AbstractPostItem *tmpAbstractPostItem;
    postScreen = new NewPost(this);
    postScreen->setWindowFlags(Qt::Window);
    postScreen->setAttribute(Qt::WA_ShowModal);
    if(postScreen->exec() == QDialog::Accepted)
    {
        tmpAbstractPostItem = postScreen->getPost();
        postsList->addPost(tmpAbstractPostItem);
        postScreen->close();
    }
}

void PostView::newPost()
{
    AbstractPostItem *tmpAbstractPostItem;
    postScreen = new NewPost(this);
    postScreen->setWindowFlags(Qt::Window);
    postScreen->setAttribute(Qt::WA_ShowModal);
    if(postScreen->exec() == QDialog::Accepted)
    {
        tmpAbstractPostItem = postScreen->getPost();
        postsList->addPost(tmpAbstractPostItem);
        postScreen->close();
    }
}

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Now my problem is that in the first and second code bit everything works just as expected, but when I try to call functions from tmpAbstractPostItem in the third code bit it uses the functions in the AbstractPostItem class instead of the PostHeaderItem class which is what I want.

So my question is how can I accomplish this?

Update:
Added the files as attachment.