QProgressBar stylesheet only renders background-color, chunk margin

A QProgressBar oriented vertically will not display stylesheet changes such as ::chunk

{width:30px}

In fact the only stylesheet changes that are rendered is background-color and margin for ::chunk. If any QProgressBar changes are attempted, the chunks are not displayed. Example: ::chunk

{background-color:#33BF33; margin:3px;}

works but ::chunk

{background-color:#33BF33; width: 30px; margin:3px;}

does not. Example: ::chunk

{background-color:#33BF33; margin:3px;}

works but "

{border: 2px solid grey; border-radius: 3px; text-align: center;}

::chunk

{background-color:#33BF33; margin:3px;}

" does not. This is true for Windows (MinGW) and Linux (Ubuntu 9.10 g++ 4.4.1) Plastique style.