I dont like them and want them gone.  they are in the upper right corner of each midi clip.
 
thank you!!

I've never heard of a way to turn this off, or hide this feature.
It's something they added to be able to double-click on a clip, in order to have it open up for editing in Piano Roll, Staff View, Event List or Step Sequencer. But you knew that, right ? You just don't like having it there visible on the clips or something like that. I personally thing it's a great feature addition . . . but if you really don't want it visible, perhaps submit this as a feature request to have the option to turn it off.

ok cool, i didn't think so.   I screws with my eyes a little bit when my tracks are the thinnest they can possibly go.  I sometimes mistaken them for notes or something.  not a big deal.   thx though!

Feature Request time...   
 

These are available from Amazon.com.  They are removable, but they should be the perfect thing to fix your problem.  Apply liberally to your monitor.  :-)
 
 

thank you everyone!  i went with ricosyl's answer... it works best.   it also adds a nice touch of color to the whole project.   problem solved!