Link to original page on YouTube.
Notice that under braking, throttle is off, but as soon as the brakes are released, I roll throttle on just a little bit. This settles the back end of the bike for the corner, and allows you to adjust your line without adjusting your lean angle. If I want to increase the turn radius, I give it a little more gas, this will push the front end wider. If I need to tighten up the line I can roll off just a little (meaning I've screwed up the turn anyway, you want your line to be defined by the corner entry under the brakes). On corner exit it looks like I just hammer the throttle, which is ok on the 250, but will ruin you on a big bike. Being smooth is key but luckily you can get pretty jolly with the throttle on the 250 since it is such a low power bike. With most of the really sticky tires, full throttle will be barely enough to spin up the rear wheel at full lean if you're well balanced.