Many players are good stickhandlers, but as soon as a puck is at their feet they lose puck possession. The key is to be able to kick the puck back to your stick and continue towards the net. Here's a drill that will train you to use your feet as another form of puck control. Soon you'll be kicking the puck on your way to a breakaway!
As always, get yourself into the scorer's frame of mind - always end a skill drill with putting a hockey shot on net - in this video on the Sniper's Edge Shooting Tarp.