C++/Qt5 - Install event filter on UI QPushButton

[jimbo]

Qt Creator 3.5.1 (opensource)
Based on Qt 5.5.1 (MSVC 2013, 32 bit)
Windows 7

Hello,

This is the first time I've used the form designer in QtCreator.
So far, so good. I have form that displays what I want.
The problem comes when I try and install an event filter on a QPushButton (bRefresh).
The button does not display, If I place the cursor where the pushbutton should be the eventFilter works.
If I do not install the event filter the button shows, but of course the eventFilter does'nt get called.
What am I doing wrong?

Regards

MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent)
{
    setupUi(this);
    ...
    ...
    bRefresh->installEventFilter(this); //is a QPushButton
}

MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent)
{
    setupUi(this);
    ...
    ...
    bRefresh->installEventFilter(this); //is a QPushButton
}

To copy to clipboard, switch view to plain text mode 

#include "ui_mainwindow.h"
 
class MainWindow : public QMainWindow, public Ui::MainWindow
{
    Q_OBJECT
 
public:
    MainWindow(QWidget *parent=0);
    ~MainWindow();
    bool eventFilter(QObject *obj, QEvent *event);

#include "ui_mainwindow.h"

class MainWindow : public QMainWindow, public Ui::MainWindow
{
    Q_OBJECT

public:
    MainWindow(QWidget *parent=0);
    ~MainWindow();
    bool eventFilter(QObject *obj, QEvent *event);

To copy to clipboard, switch view to plain text mode 

bool MainWindow::eventFilter(QObject *obj, QEvent *event)
{
    if (obj == (QObject*)bRefresh)
    {
        if (event->type() == QEvent::Enter)
        {
            QApplication::setOverrideCursor(QCursor(Qt::ArrowCursor));
            qDebug() << "enter";
        } else {
            if (event->type() == QEvent::Leave)
            {
                QApplication::restoreOverrideCursor();
                qDebug() << "leave";
            }
        }
        return true;
    } else {
        return QWidget::eventFilter(obj, event);
    }
}

bool MainWindow::eventFilter(QObject *obj, QEvent *event)
{
    if (obj == (QObject*)bRefresh)
    {
        if (event->type() == QEvent::Enter)
        {
            QApplication::setOverrideCursor(QCursor(Qt::ArrowCursor));
            qDebug() << "enter";
        } else {
            if (event->type() == QEvent::Leave)
            {
                QApplication::restoreOverrideCursor();
                qDebug() << "leave";
            }
        }
        return true;
    } else {
        return QWidget::eventFilter(obj, event);
    }
}

To copy to clipboard, switch view to plain text mode