Mac OS X Lion how to hide the entire OS Dock Bar

[budda]

Not sure if I am stating the question correctly.
I am trying to get an Qt app to use 100% of the screen.
This includes the Dock Bar with all the programs at the bottom.
I would prefer not to use:

this->showFullScreen();

this->showFullScreen();

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because I would like the app to use the entire desktop, including multiple monitors.
without showFullScreen() I have all of the screen real estate, but the OS Dock Bar is ontop of my app....
if I use showFullScreen() the app is fullscreen with the bottom Dock Bar hidden unless you hover at the bottom, but only for 1 monitor.....
is there a way to manually hide the OS Dock Bar? like how the showFullScreen() does it?

I am using Qt5.3.1 for Mac OS X 10.7.3 Lion, and also relevant is:

this->setWindowFlags(Qt::FramelessWindowHint|Qt::WindowStaysOnTopHint|Qt::X11BypassWindowManagerHint);

this->setWindowFlags(Qt::FramelessWindowHint|Qt::WindowStaysOnTopHint|Qt::X11BypassWindowManagerHint);

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