I would say never, ever use the front brake while cornering. Unless you are racing you should not need to brake hard into the apex etc etc. If you find your corner speed a little hot lightly apply the back break. Many a people have binned it from grabbing a handful of the front and washing out. Get all your speed/gears and body position sorted before the corner. You should not upset the balance while in the corner. Look through the corner and accelerate through. But keep doign what you are doing, practicing leaning a little more each time until you feel happy and confident. Remember 99% of the time the bike can outride your skill.
Best of luck.
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