Major Description
Table columns cannot in any way be altered to change alignment. The default alignment is centered, due to this code in the render component ("SimpleTableColumnComponent"):
<table border=0 cellspacing=0 cellpadding=0 align="center">
Because of this, you can't use CSS to modify the alignment. I have to manually change the code in the Tapestry source and rebuild to allow anything other than center-aligned columns.
Some (on the mailing lists) have suggested using a different renderer, but that doesn't appear possible without writing a lot of custom renderer code (basically, replace the entire SimpleTableXX component family just to replace one part of it). All to replace something that should be CSS-controllable anyway.