Which Control Is It ?

Heyy mpgh, i recently downloaded a .net library for visual studio that adds controls to a form. one of these controls is in the screenshot bellow and it isn't working. the .net library is anonymous and it won't let me download it from the link again (How screwed is that).

would anyone know a way to download that or if i'm real chooby and i just don't know the name for it? it seems to be in nearly all microsofts products. so i think it's a legit microsoft thing thats included but i can't find it. any suggestions?