Need help on QFileDialog pleasee

[jirach_gag]

Hi all, I was creating an application. My application will open a folder and process all of the images in that folder.
I used the method QFileDialog::getExistingDirectory to let the user choose the directory. But when I execute the
program the file dialog look like this



as you can see that nothing appear, there is no directory list to let the user choose. And I don't know why ?
Anybody know why is this happen ???

PS:: I use Qt 4.4.3 with eclipse integration. Earlier in the code I used QFileDialog::getOpenFileName it was successfully open the file dialog. But the QFileDialog::getExistingDirectory does not success.

Here is the code

// This slot is call when user open file.--------------------------------------
void DR_GUI_NEW::screenFile(){
 
	// Get user selected file path
	fileName = QFileDialog::getOpenFileName(this, tr("Open image file for screening"),
													QDir::currentPath(),
													tr("Images (*.bmp *.jpg *.tiff *.png *.tif)"));
 
	// filename is not empty
	if (!fileName.isEmpty()) {
 
		image.load(fileName);
		// Load input image
		if (image.isNull()) {
			QMessageBox::information(this, tr("Diabetic Retinopathy"), tr("Cannot load \"%1\"").arg(fileName));
			return ;
		}
		ui.radioButton_IP_1->setEnabled(true);
 
		// Show input Image
		ui.mainImageLabel->setPixmap(QPixmap::fromImage(image));
 
		// Enable Processing Algorithms
		ui.actionOld_Algorithms->setEnabled(true);
		ui.actionNew_Algorithm->setEnabled(true);
 
	}
	//file name is empty
	else{
		// If filename is empty
		// Only empty when user press cancel
		// No need to catch error Here ??
	}
 
}// end screenFile slot
 
 
 
// screenDirectory slot -------------------------------------------------------
void DR_GUI_NEW::screenDirectory(){
	QMessageBox::information(this, tr("Directory Mode"), tr("Welcom to Directory Mode"));
 
	dirPath = QFileDialog::getExistingDirectory(this,
			tr("Please select directory to screen"),
			QDir::currentPath(),
			QFileDialog::ShowDirsOnly | QFileDialog::DontResolveSymlinks);
}
//-----------------------------------------------------------------------------

// This slot is call when user open file.--------------------------------------
void DR_GUI_NEW::screenFile(){

	// Get user selected file path
	fileName = QFileDialog::getOpenFileName(this, tr("Open image file for screening"),
													QDir::currentPath(),
													tr("Images (*.bmp *.jpg *.tiff *.png *.tif)"));

	// filename is not empty
	if (!fileName.isEmpty()) {

		image.load(fileName);
		// Load input image
		if (image.isNull()) {
			QMessageBox::information(this, tr("Diabetic Retinopathy"), tr("Cannot load \"%1\"").arg(fileName));
			return ;
		}
		ui.radioButton_IP_1->setEnabled(true);

		// Show input Image
		ui.mainImageLabel->setPixmap(QPixmap::fromImage(image));

		// Enable Processing Algorithms
		ui.actionOld_Algorithms->setEnabled(true);
		ui.actionNew_Algorithm->setEnabled(true);

	}
	//file name is empty
	else{
		// If filename is empty
		// Only empty when user press cancel
		// No need to catch error Here ??
	}

}// end screenFile slot



// screenDirectory slot -------------------------------------------------------
void DR_GUI_NEW::screenDirectory(){
	QMessageBox::information(this, tr("Directory Mode"), tr("Welcom to Directory Mode"));

	dirPath = QFileDialog::getExistingDirectory(this,
			tr("Please select directory to screen"),
			QDir::currentPath(),
			QFileDialog::ShowDirsOnly | QFileDialog::DontResolveSymlinks);
}
//-----------------------------------------------------------------------------

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