[Water Warrior 2]

Low speed and the front brake will do it 112% of the time. At speed the wheels act as gyros to keep the bike upright. At low speed in a parking lot the combo of front brake and front end geometry will dump you very easily. Anything under 10 MPH should be a rear brake only until you get a good feel for the bike.
The front brake can be used in a curve to scrub off speed if you go in too hot but be careful and just practice with a light grip on the front brake to gain confidence. This comes in handy if you ever go too fast into a decreasing radius curve and know the rear will lock up and hurt you.
There is a very good explaination of front end geometry in Proficient Motorcycling by David Hough.