breakpoint inside QComboBox subclass not working

I have subclassed QComboBox to customize it for special needs. The subclass is used to promote QComboBoxes in a ui file from QtDesigner. Everything works except that when I put a break point in a slot, the program does not stop at the breakpoint. I do however know that it is being called from the result it generates. I checked other slots in my program and they work fine with breakpoints. Doing a clean and rebuild all did not fix it. What could be causing this and is there anything I can do about it? The slot in question is the only one in the subclass and is called "do_indexChanged()". You can find the slot on line 37 of the class header below and the signal-slot connection on line 10 of the class source file.

CLASS HEADER:

Code:

#ifndef WVQCOMBOBOX_H
#define WVQCOMBOBOX_H
 
#include <QWidget>
#include <QObject>
#include <QComboBox>
#include <QVariant>
 
 
 
class wvQComboBox : public QComboBox
{
Q_OBJECT
//Q_PROPERTY(bool writeEnable READ writeEnable WRITE setWriteEnable)
public:
    explicit wvQComboBox(QWidget *parent = 0);
    bool writeEnable() {
        return this->property("writeEnable").toBool();
    }
    void setWriteEnable(const bool & writeEnable){
        this->setProperty("writeEnable",writeEnable);
    }
 
    bool newValReady() {
        return this->property("newValReady").toBool();
    }
    void setNewValReady(const bool & newValReady){
        this->setProperty("newValReady",newValReady);
    }
    QString getNewVal();
    int getNewValIndex();
 
 
 
    int oldVal;  //comboBox Index before user edit began
private slots:
    void do_indexChanged(){
        this->setWriteEnable(true);
        if(oldVal!=currentIndex()){
            this->setNewValReady(true);
            oldVal=currentIndex();
        }
    }
 
protected:
    void focusInEvent ( QFocusEvent * event );
    //void focusOutEvent ( QFocusEvent * event );//dont need because of currentIndexChanged(int)
};
 
#endif // WVQCOMBOBOX_H

CLASS SOURCE

Code:

#include "wvqcombobox.h"
 
wvQComboBox::wvQComboBox(QWidget *parent) :
    QComboBox(parent)
{
    this->setWriteEnable(true);
    this->setNewValReady(false);
    oldVal=this->currentIndex();
 
    connect(this,SIGNAL(currentIndexChanged(int)),this,SLOT(do_indexChanged()));
}
 
void wvQComboBox::focusInEvent ( QFocusEvent * event ) {
    this->setWriteEnable(false);
    oldVal=this->currentIndex();
}
 
 
QString  wvQComboBox::getNewVal(){
    setNewValReady(false);
    return this->currentText();
}
 
int wvQComboBox::getNewValIndex(){
    setNewValReady(false);
    return this->currentIndex();
}