How i can access my custom plugin when i loaded a ui file, my program crashed

[serjik]

Hello
I design a simple Qt designer custom plugin, i need this plugin for Qt Designer, its ok and it has no problem, i start to design my main program, i want to load a ui file which contains my custom widgets, i use uitools to load this ui file and also with no problem,
but i need to access this custom widgets in ui file after loading, here is a small problem and it's just not work. i attached my custom plugin source and two test projects, what can i do ? any suggestion ? PLEASE!?!

//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
main.cpp===========
 
#include <QApplication>
#include <QUiLoader>
#include <QWidget>
#include <QFile>
#include <QMainWindow>
#include <QtGui>
 
#include "QGLabel.h"//???????????????????
 
//Qt 4.7.0
 
int main(int argc, char **argv)
{
    Q_INIT_RESOURCE(test);
 
    QApplication app(argc, argv);
 
    QUiLoader loader;
    QFile uiFile(":/test.ui");
    uiFile.open(QIODevice::ReadOnly);
    QWidget *ui = loader.load(&uiFile);
    uiFile.close();
 
    ui->show();
 
//-------------------------------------------------------------------------
 
    //after loading this form i need to access its child widgets
 //   QGLabel *l1 = qFindChild<QGLabel *>(ui, "g0");
 
    qDebug() << "---------------------";
   // qDebug() << l1;//here shoes the pointer is null
    qDebug() << "---------------------";
 
    //but when i try to access one of this child custom widgets
    //my program crashed
   // l1->setText("i can change it");//here crashed
 
    //so i need to make a QList of this custom widgets
    //QList<QGLabel *> allQGLabels = ui->findChildren<QGLabel *>();
 
//PLEASE what can i do??
 
    return app.exec();
}

//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
main.cpp===========

#include <QApplication>
#include <QUiLoader>
#include <QWidget>
#include <QFile>
#include <QMainWindow>
#include <QtGui>

#include "QGLabel.h"//???????????????????

//Qt 4.7.0

int main(int argc, char **argv)
{
    Q_INIT_RESOURCE(test);

    QApplication app(argc, argv);

    QUiLoader loader;
    QFile uiFile(":/test.ui");
    uiFile.open(QIODevice::ReadOnly);
    QWidget *ui = loader.load(&uiFile);
    uiFile.close();

    ui->show();

//-------------------------------------------------------------------------

    //after loading this form i need to access its child widgets
 //   QGLabel *l1 = qFindChild<QGLabel *>(ui, "g0");

    qDebug() << "---------------------";
   // qDebug() << l1;//here shoes the pointer is null
    qDebug() << "---------------------";

    //but when i try to access one of this child custom widgets
    //my program crashed
   // l1->setText("i can change it");//here crashed

    //so i need to make a QList of this custom widgets
    //QList<QGLabel *> allQGLabels = ui->findChildren<QGLabel *>();

//PLEASE what can i do??

    return app.exec();
}

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//++++++++++++++++++++++++++++++++++++++++++++++++++ ++++++++++++
test.prj ===========


CONFIG += uitools



RESOURCES += test.qrc

SOURCES += main.cpp

#HEADERS += QGLabel.h


//++++++++++++++++++++++++++++++++++++++++++++++++++ ++++++++++++