differences in CSS : development-bundle ui.all.css vs jquery-ui-1.7.2.custom.css

differences in CSS : development-bundle ui.all.css vs jquery-ui-1.7.2.custom.css

While making a themeswitcher, I encountered weird problems with the
development bundle.
By including ui.all.css I was hoping to make a generic solution by
using the directory name, but:
- resizable styling was weird: the resize icon was on the lower left
of the div and not on the lower right.
- Dialog: alignment of the header was weird: the close button was
below the headertext, and the header itself was a couple of pixels
wider then its parent container: ui-corner-all looked weird. Same
happened to the footer.
When I included jquery-ui-1.7.2.custom.css instead of ui.all.css, all
was styled properly.
I didn't find the problem/differences.
Above problem was both on IE8 and Firefox 3.5(.5)
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