How to Call a QDialog in QMainWindow

[schnitzel]

perhaps you might try to read the docs:
http://doc.qt.nokia.com/4.6/qdialog.html#details

[ranjit.kadam]

hello ,to go to your new dialog on pushbutton clicked,you should code as below
void MainWindow:n_pushButton_clicked()
{
Dialog a(this);//the name of ur dialog
a.show();//show your dialog
a.exec();
}