QT Newbie ( how to open widget from mainwindow )

 

I am a Newbie in Qt and i want to know that “how to open widget from mainwindow” Can any one provide the code
i have write some code but widget are not disp—layed.

Thanks in Advance

//MainWindow.cpp

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

QLabel *label = new QLabel(“Name:”); //QLineEdit *lineEdit = new QLineEdit(); QHBoxLayout *layout = new QHBoxLayout(); layout->addWidget(label , 0, 0); this->setLayout(layout);

}
void MainWindow::open(){
AnotherMainWindow * w2 = new AnotherMainWindow(this);
w2->show();
//w2.showFullScreen();
//this->hide();

//MainWindow.h( i have added in .h)
public slots : void open() ;

//main.cpp

w.showMaximized();