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    <p>I am able to do it well. I just give the code for anyone who need this. I have a window called <code>MainWindow</code> and a <code>NewWindow</code>. I have a button in <code>Mainwindow</code> called <code>mMyButton</code>. <code>mainwindow.h</code> is as follows.</p> <pre><code>#ifndef MAINWINDOW_H #define MAINWINDOW_H #include &lt;QMainWindow&gt; //added #include"newwindow.h" namespace Ui { class MainWindow; } class MainWindow : public QMainWindow { Q_OBJECT public: explicit MainWindow(QWidget *parent = 0); ~MainWindow(); //added public slots: void openNewWindow(); //added name of the new window is NewWindow private: NewWindow *mMyNewWindow; private: Ui::MainWindow *ui; private slots: void on_mMyButton_clicked(); }; #endif // MAINWINDOW_H </code></pre> <p>My newwindow.h is as follows.</p> <pre><code>#ifndef NEWWINDOW_H #define NEWWINDOW_H #include &lt;QMainWindow&gt; namespace Ui { class NewWindow; } class NewWindow : public QMainWindow { Q_OBJECT public: explicit NewWindow(QWidget *parent = 0); ~NewWindow(); private: Ui::NewWindow *ui; }; #endif // NEWWINDOW_H </code></pre> <p>My mainwindow.cpp is as follows.</p> <pre><code>#include "mainwindow.h" #include "ui_mainwindow.h" MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow) { ui-&gt;setupUi(this); //Added connect(ui-&gt;mMyButton, SIGNAL(click()), this, SLOT(openNewWindow())); } MainWindow::~MainWindow() { delete ui; } void MainWindow::openNewWindow() { mMyNewWindow = new NewWindow(); mMyNewWindow-&gt;show(); } void MainWindow::on_mMyButton_clicked() { openNewWindow(); } </code></pre> <p>My newwindow.cpp,</p> <pre><code>#include "newwindow.h" #include "ui_newwindow.h" NewWindow::NewWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::NewWindow) { ui-&gt;setupUi(this); } NewWindow::~NewWindow() { delete ui; } </code></pre> <p>My main.cpp as,</p> <pre><code> #include &lt;QtGui/QApplication&gt; #include "mainwindow.h" int main(int argc, char *argv[]) { QApplication a(argc, argv); MainWindow w; w.show(); return a.exec(); } </code></pre> <p>Thanks for all the information. And enjoy the programming with Qt.</p>
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