I'm not 100% sure if I have released this earlier, but this is my Blitzmax gui, not completely done but works ok. I haven't touched Blitzmax for ages but found this from my projects folder.
Source+bin:
http://mythofguera.com/nawi/blitz/bmxgui.zip
Source+bin:
http://mythofguera.com/nawi/blitz/bmxgui.zip