I'm not quite sure what you're asking. The Run and Reset buttons are always there - they are part of the Greenfoot runtime. You cannot get rid of them, if that's what you're asking.

Thanks for your answer. I do not want to get rid of them, but I want to ask where they get there? I mean, what part of the code that shows they are there? btw, sorry if my English is poor

The code is part of Greenfoot, and you cannot see it (other than looking at the source code for Greenfoot itself). When you create a jar with Greenfoot, Greenfoot adds a number of classes of its own that make the whole system work. The buttons are part of this.