memory leaks detection in QT

[kompotFX]

I'm trying to use QT creator 0.9.1 with built-in Qt version 4.4.3 (win32 & mingw).

here is simple code which generates memory leak:

#include <QtGui/QApplication>
#include "mainwnd.h"

int main(int argc, char *argv[])
{
char* buf=new char[10];

QApplication a(argc, argv);
MainWnd w;
w.show();
return a.exec();
}

trying to run application in debug mode. Closing application wont inform me about memory leaks. :-(
Is it any QT methods/classes, which can inform me about memory leaks?
What QT developers use for simple heap analysis?