Layout messing up

hey there i have a QHBox of my main widget, QHBox of buttons and then i have a QHBox of a QStatusBar but when i add them to my main layout the QStatusBar widget ends up taking half the space on my tab dialog....why is this happening? heres the code below and i attached the image of how it looks now...

Code:

sortingBox = new SortingBox;
	QVBoxLayout *mainLayout = new QVBoxLayout;
 
 
	QHBoxLayout * buttonsLayout = new QHBoxLayout;
	QHBoxLayout * messageLayout = new QHBoxLayout;
	QGridLayout * gridLayout = new QGridLayout;
 
 
	QPushButton * clearButton = new QPushButton("Clear");
	connect(clearButton, SIGNAL(clicked()), sortingBox, SLOT(clear()));clearButton->setShortcut(tr("Ctrl+R"));
	buttonsLayout->addWidget(clearButton);
 
	QPushButton * clearLinks = new QPushButton("Clear Links");
	connect(clearLinks, SIGNAL(clicked()), sortingBox, SLOT(clearLinks()));
	buttonsLayout->addWidget(clearLinks);
 
	QPushButton * clearLastLink = new QPushButton("Clear Last Link");
	connect(clearLastLink, SIGNAL(clicked()), sortingBox, SLOT(clearLastLink()));
	buttonsLayout->addWidget(clearLastLink);
 
	QPushButton * dijkstra = new QPushButton("Calc Shortest Path");
	connect(dijkstra, SIGNAL(clicked()), sortingBox, SLOT(startDijkstra()));
	buttonsLayout->addWidget(dijkstra);
 
	QStatusBar * sbar = new QStatusBar();
	connect(sortingBox, SIGNAL(showStatus(QString)), sbar, SLOT(showMessage(QString)));
	messageLayout->addWidget(sbar);
 
	//gridLayout->addLayout(buttonsLayout, 0, 0);
	//gridLayout->addWidget(sbar, 1, 0, 1, 0);
	mainLayout->addWidget(sortingBox);
	mainLayout->addLayout(buttonsLayout);
	mainLayout->addWidget(sbar); 
    setLayout(mainLayout);