QUiLoader flawed/not providing name for Layouts. Workaround?

[ZB]

Thanks, when doing this I get a pointer back rather than 0, however the application still crashes when trying to add my QScrollArea to the layout. Any hints?

EDIT: First time I tried layout() on the central widget I got a valid pointer, but consecutive runs yield a 0 pointer like previously :S

Main

int main(int arg_count, char **arg_list)
{
	QApplication juliet(arg_count, arg_list);
	QApplication::setStyle(new QPlastiqueStyle);
 
	mainwindow ui;
	ui.show();
 
	return juliet.exec();
}

int main(int arg_count, char **arg_list)
{
	QApplication juliet(arg_count, arg_list);
	QApplication::setStyle(new QPlastiqueStyle);

	mainwindow ui;
	ui.show();

	return juliet.exec();
}

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Class header

class mainwindow:public QMainWindow
{
	Q_OBJECT
 
public:
 
	mainwindow();
 
	QScrollArea *render_window;
	QLabel *label_render;
	QGridLayout *render_layout;
 
...
 
};

class mainwindow:public QMainWindow
{
	Q_OBJECT

public:

	mainwindow();

	QScrollArea *render_window;
	QLabel *label_render;
	QGridLayout *render_layout;

...

};

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Class implementation

mainwindow::mainwindow()
{
	QUiLoader loader;
	QFile file(":/interface/juliet.ui");
	file.open(QFile::ReadOnly);
	QWidget *central = loader.load(&file);
	setCentralWidget(central);
	file.close();
 
	label_render	= findChild<QLabel*>("label_render");
	render_layout	= qobject_cast<QGridLayout*>(central->layout());
	render_window	= new QScrollArea;
 
	QPixmap pixmap(200, 200);
	pixmap.fill(Qt::black);
	label_render->setPixmap(pixmap);
	label_render->setAlignment(Qt::AlignCenter);
	render_window->setWidget(label_render);
	render_window->setWidgetResizable(true);
	render_window->setFocusPolicy(Qt::NoFocus);
	render_window->installEventFilter(this);
	render_layout->addWidget(render_window, 0, 0, 1, 4);  // <-- Application crash
 
	QMetaObject::connectSlotsByName(this);
}

mainwindow::mainwindow()
{
	QUiLoader loader;
	QFile file(":/interface/juliet.ui");
	file.open(QFile::ReadOnly);
	QWidget *central = loader.load(&file);
	setCentralWidget(central);
	file.close();

	label_render	= findChild<QLabel*>("label_render");
	render_layout	= qobject_cast<QGridLayout*>(central->layout());
	render_window	= new QScrollArea;

	QPixmap pixmap(200, 200);
	pixmap.fill(Qt::black);
	label_render->setPixmap(pixmap);
	label_render->setAlignment(Qt::AlignCenter);
	render_window->setWidget(label_render);
	render_window->setWidgetResizable(true);
	render_window->setFocusPolicy(Qt::NoFocus);
	render_window->installEventFilter(this);
	render_layout->addWidget(render_window, 0, 0, 1, 4);  // <-- Application crash

	QMetaObject::connectSlotsByName(this);
}

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