Proposition: add button "Back"

One of most used button is "Cntrl-Tab". Often it is applied to return to editing a previous file of to find some early edited file. May be, by analogy with web-brousers, to add a button "Back" at the top left edge of PSPAD-window? For example, to left the button "Create new document". Everything knows that "back"-button return us to a previous web-page, in our case it would be return to previous file.
Also, resuming, let add "Back"-button as an alias for "Cntrl-Tab".

Ctrl+Tab is next document, Shif+Ctrl+Tab is previous document

It works like in your web browser