closing a dialog

[RSX]

I made a plasma app that opens a settings dialog
I'm trying to close a dialog with a close button
If I open it like this

void test::settings() { 
 myQtApp *dialog = new myQtApp;
 dialog->show();
}

void test::settings() { 
 myQtApp *dialog = new myQtApp;
 dialog->show();
}

To copy to clipboard, switch view to plain text mode 

How can i close it like this

myQtApp::myQtApp(QWidget *parent)
{
    setupUi(this);
    connect( pushButton_close, SIGNAL( clicked() ), this, SLOT( close() ) ); 
}
void myQtApp::close() {
  QMessageBox::about(this,"close",
  "this shold close the dialog");
}

myQtApp::myQtApp(QWidget *parent)
{
    setupUi(this);
    connect( pushButton_close, SIGNAL( clicked() ), this, SLOT( close() ) ); 
}
void myQtApp::close() {
  QMessageBox::about(this,"close",
  "this shold close the dialog");
}

To copy to clipboard, switch view to plain text mode 

Didn't read up all if you actually fixed your problem already but:

myQtApp *dialog = new myQtApp(this);
dialog->setAttribute(Qt::WA_DeleteOnClose);
dialog->show();

myQtApp *dialog = new myQtApp(this);
dialog->setAttribute(Qt::WA_DeleteOnClose);
dialog->show();

To copy to clipboard, switch view to plain text mode 

this would solve your problem with deleting dialog.