How to add buttons to a customized RViz panel

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Hello, I am sub-classing RViz to create a small customized panel. I found this and started doing this tutorial. However I was trying to implement a couple of buttons. I did using getNumViews() function available here. As I click on the button nothing happens and the view never changes. Is there something I am missing? Thanks for shedding light on this issues. Below the code:

myviz.h

public Q_SLOTS:
    void switchToTopView(QString viewName);
    void switchToSideView(QString viewName);

private:
    QString sideView = "Side View";
    QString topView = "Top View";

myviz.cpp

MyViz::MyViz(QWidget *parent) : QWidget(parent)
{

// Setting up constructor

    QPushButton *topViewBtn = new QPushButton("Top View");
    QPushButton *sideViewBtn = new QPushButton("Side View");


    QGridLayout* control_layout = new QGridLayout();
    control_layout->addWidget(topViewBtn, 3, 0);
    control_layout->addWidget(sideViewBtn, 3, 1);

    // construct lay-out and render panels next to each other
    render_panel = new rviz::RenderPanel();

    connect(topViewBtn, SIGNAL(clicked()), this, SLOT(switchToTopView(QString("Top View"))));
    connect(sideViewBtn, SIGNAL(clicked()), this, SLOT(switchToSideView(QString("Side View"))));

// Other operations

}

void MyViz::switchToTopView(QString viewName)
{
    topView = viewName;
    view_man = manager->getViewManager();
    view_man->getNumViews();
    view_man->getViewAt(1)->getName() = topView;
    view_man->setCurrentFrom(view_man->getViewAt(1));
}

void MyViz::switchToSideView(QString viewName)
{
    sideView = viewName;
    view_man = manager->getViewManager();
    view_man->getNumViews();
    view_man->getViewAt(2)->getName() = sideView;
    view_man->setCurrentFrom(view_man->getViewAt(2));
}