How to make Toolbar to Expand the Qtreeview in DOM?

[Aviral 0]

I want to Add another toolbar Icon next to the first one.
The First Icon loads the XML file into Treeview

QToolBar *fileToolBar = addToolBar(tr("FIND"));
     const QIcon newIcon = QIcon::fromTheme("FIND", QIcon("Image\\FIND.png"));
     QAction *newAct = new QAction(newIcon, tr("&FIND"), this);
     newAct->setShortcuts(QKeySequence::Open);
     connect(newAct, &QAction::triggered, this, &MainWindow::openFile);
     fileToolBar->addAction(newAct);

I want that Second tool item Expands the Treeview.
So far I have tried:
But It didn't worked!

     QToolBar *ExpandToolBar = addToolBar(tr("Expand"));
     const QIcon newIcon2 = QIcon::fromTheme("Expand", QIcon("\Image\\Expand.png"));
     QAction *newAct2 = new QAction(newIcon2, tr("&Expand"), this);
     newAct2->setShortcuts(QKeySequence::SelectStartOfLine);
     connect(newAct2, &QAction::isVisible, this, &MainWindow::expandChildren);
     ExpandToolBar->addAction(newAct2);

Where expandChildren Function is as Follow:

void MainWindow::expandChildren(const QModelIndex &index, QTreeView *view)
{
    if (!index.isValid()) {
        return;
    }

    int childItem = index.model()->rowCount(index);
    for (int i = 0; i < childItem; i++) {
        const QModelIndex &child = index.sibling(i, 0);
        // Recursively call the function for each child node.
        expandChildren(child, view);
    }

    if (!view->isExpanded(index)) {
        view->expand(index);
    }
}

In the Image I have shown Where I want that Icon.

[mpergand]

@Aviral-0 said in How to make Toolbar to Expand the Qtreeview in DOM?:

QToolBar *fileToolBar = addToolBar(tr("FIND"));
QToolBar *ExpandToolBar = addToolBar(tr("Expand"));

You create a new toolbar each time, you only need one.