Bandpopup with hflex="1" does not adapt its width to parents fixed width, but is rendered with width of 100% of screen.

see the fiddle:
http://zkfiddle.org/sample/73m6oh/15-Bandbox-Sizing-Issue

run it, start typing in the text box, observe bandpopup is 100% wide, while it should be of the same width as fixed width bandbox.