Spells efficentcy.

Hey i wanted to ask if this is the most efficient way to create a bar with my skills or if there is a shorter way or better way:

I need the player to be able to switch spells on his bar by drag/dropping them else where.

<img src="http://dl.dropbox.com/u/53738503/example%20Fireball.png" border="0" />

Notice how i used two different Drag/Drop behaviors. Are they equally good?

Edit:

Whoops, little mistake in the example picture :) Ignore the Double "Skill fireball" that i seem to have Pasted. Only Skillfireball in the first and Skilliceshards in the second.