Import Sprite Sheet inactive

Been messing around with this for an bit now and cannot find the answer on the forum or with just playing around. For some reason I am unable to import a sprite trip in the animation window. The import sprite strip option is just grayed out and inactive. What am I doing wrong. I know I am doing something stupid and any help is appreciated.

Ok, so answered my own question. Clicked on the "set collision polygon" menu item and then went back to the animation section and right clicked and then I was good to go again. Not sure what I was doing wrong there. I think I was on the marquee tool and it was not allowing me to add sprite strips.