How can I create QFrame on form ui?

[delio]

How can I create QFrame by coding.
and place it into form ui?

Thanks

[topix93]

@
#include "MainWindow.h"
#include "ui_MainWindow.h"
#include <QLayout>

MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);

QFrame *mFrame = new QFrame(this);
mFrame->setGeometry(50, 50, 100, 100);
mFrame->setStyleSheet("background-color:black;");

this->layout()->addWidget(mFrame);

}
@

[delio]

If I want to refer it in main.cpp not mainwindow.cpp
how can I do?

Thanks for answer