I've uploaded a new version 0.0.9 of TOOLBAR. This one has a feature that will grow the toolbar size if you set the width of the toolbar initially to 0 -1. So now you can make TOOLBAR decide the size of your window, rather than only the other way around.

The default for TOOLBAR is still 100x50, but BUTTON-BAR is now set to 0x50 -1x50, so it will grow in size as it should.

You can find TOOLBAR in the Downloads section.