Sidebar - remove Dropbox and a non calendar

I figured out how to customize the sidebar in Preferences, but it won't let me remove Dropbox from the sidebar, and a book. The book is an inDesign file that I use to create an annual weekly calendar; it has the name "2012 Calendar." Apparently Apple thinks we have to have a calendar in the sidebar whether we want one there or not and my system has decided this must be my choicest calendar.

Any way to remove this inDesign file and Dropbox icons?

Thank you,

Lan

 

Thank you. Works perfectly.
Can't believe I didn't try that.