For some reason, in a car i'm designng with the pen tool, some of the drawings are surrounded with blue boxes. It makes it difficult to select and highlight things beaus when ever i click on something all the boxes get selected too. How do i get rid of this? And also, what does his have to do with clipping masks? On some of the boxes it says "releasecliiping mask" or "undo release clipping mask" what is this?