Use the dropdownlist on the top-left to control which GUI action/condition/event you wish to view, and in the middle panel the information about the selected item will appear. For presets parameters, you can actually simply click on the preset and it will generate a table with information about possible preset options.
This is a good and convenient tool for beginners switching from GUI to Galaxy, though there are some things that you have to research on your own about such as UnitFilterStr, etc.
Please tell me if there are any bugs / suggestions :D
whoa, this is a really huge contribution to the mapster and the modding community as a whole.
I personally, would very much like to convert all the GUI triggers into a pure code once I get my programming skills and knowledge to the level which would allow it. And your creation would be a huge help in that!