[Solved]-Create a GUI using WindowBuilder's visual designer-eclipse

in eclipse's package explorer pane, right-click on the package that you want your new gui class to be in (create a new package first if it doesn't exist).
select new/other... from the pop-up menu.
under "windowbuilder", expand "swing designer".
select "jframe".
click "next".
in the subsequent dialog window, be sure that the package name is correct and type in the desired class name for your new gui frame. use a clearly descriptive name that tells the reader what this frame is for and that it is a frame, e.g. "mainappframe".
the "use advanced template" checkbox should be checked.
click "finish"
now click on the design tab (at the bottom of the editor!) credit to dude for that bit.