Ah. That was a pretty amazing offering from Ken Ray about 10 years ago (or more?) It has been unsupported for some time, replaced now by LC widgets which you can find in the LC tool palette. Ken's Drop Tools may have inspired our current widgets, but at any rate, you can write your own if you learn LiveCode Builder, or hire someone to make one for you.
Ken's Drop Tools were actually made in LC with normal LC controls and scripting. You can still do that too. A group of controls can function as an independent widget and there are LC commands and messages specifically set up to handle that.