Progress Bar Dialog using threads

[dove17]

HI,
I am trying to call Progress bar Dialog using thread from my main gui window but the progress bar does not proceed. Here is the code snippet.

From main
************

myGUI::myGUI(QWidget *parent, Qt::WFlags flags)
    :QMainWindow(parent, flags),
     m_UiIsReadyToQuit(false)
{
    ui.setupUi(this);
    mProgressBarDialog = NULL;
       connect(&thread, SIGNAL(ShowPB()),myPBarDialog,SLOT(PBoutput()));
}
 
void myGUI::Add_clicked()
{
      if(myProBarDialog == NULL) {
        myProBarDialog = new proBarDialog(this);
      }
	myProBarDialog->show();
 
	// call the thread here
	thread.render();
 
	updateInstanceList();
 
	// Stop the thread here
	if (mProgressBarDialog != NULL)
	{
		mProgressBarDialog->close();
		mProgressBarDialog = NULL;
	}
	 thread.stop();
}

myGUI::myGUI(QWidget *parent, Qt::WFlags flags)
    :QMainWindow(parent, flags),
     m_UiIsReadyToQuit(false)
{
    ui.setupUi(this);
    mProgressBarDialog = NULL;
       connect(&thread, SIGNAL(ShowPB()),myPBarDialog,SLOT(PBoutput()));
}

void myGUI::Add_clicked()
{
      if(myProBarDialog == NULL) {
        myProBarDialog = new proBarDialog(this);
      }
	myProBarDialog->show();

	// call the thread here
	thread.render();

	updateInstanceList();

	// Stop the thread here
	if (mProgressBarDialog != NULL)
	{
		mProgressBarDialog->close();
		mProgressBarDialog = NULL;
	}
	 thread.stop();
}

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Thread code is like this
*****************

void PBarThread::render()
{
	start(HighestPriority);
}
 
 
void PBarThread::run()
{
	emit ShowPB();
}
 
and PBarDialog code is like this
******************
pBarDialog::pBarDialog(QWidget *parent)
    : QDialog(parent)
{
	ui.setupUi(this);
	ui.pBar->show();
 
}
 
void pBarDialog::PBoutput()
{
	ui.pBar->show();
}

void PBarThread::render()
{
	start(HighestPriority);
}


void PBarThread::run()
{
	emit ShowPB();
}

and PBarDialog code is like this
******************
pBarDialog::pBarDialog(QWidget *parent)
    : QDialog(parent)
{
	ui.setupUi(this);
	ui.pBar->show();

}

void pBarDialog::PBoutput()
{
	ui.pBar->show();
}

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In Debug mode I can see that the call goes to ui.pBar->show() (not in PBOutput function). I see a frozen progress dialog, although it is running in separate thread. Why do I see a frozen Progress dialog? Why the slot PBoutput is not called although debug shows that thread has emited ShowPB() signal.

Help,
Dove17