I leat from my previous post (menu with long list of menuitems) that it is not possible to change the layout of a dropdown menu. I have tried with adding a listener to menu and open a new composite and display the composite filled with buttons in multiple columns. But the same looks odd as opens a separate floating window and does not looks like it belong to a menu.
Wonder if we have multi-column dropdown menu in some 3rd party custom developed widgets. Don't know if nebula already has or not. Can any one comment here?