Please provide more information. What are you using? - LXDE? Openbox? ZenMini? MiniMe? E17? - What app is it you're working with? What exactly are you trying to do? What steps have you taken to accomplish this? Were any error messages generated? If so, what were they? (Be exact, not general.) Give any and all pertinent information.
The more exact and specific the information you provide, the more likely it is that someone can help.