I am trying to create some vectored graphics on photoshop and I am having issues finding how to get my pen tool to lock onto a guide. I have a picture here showing what I am looking at: http://i.imgur.com/I9zH1tF.jpg . I am hoping that there is a key I can press that allows photoshop to help me guide my pen tool to the guides I have made. Please let me know if there is a way to do this or if more clarification is needed. Thanks in advance.