override single part of a cssresource with custom css

Hi,
I'm building against trunk and I was trying to override the default
css of one part of a CellTree.Style as defined by
CellTree.BasicResource.cellTreeStyle found in com/google/gwt/user/
cellview/client/CellTreeBasic.css
Is there a way to take all the values in CellTreeBasic.css but replace
cellTreeItemValue() with my own css rather than replace the whole
stylesheet.
Of course I can copy and paste it but that seems unnecessary
duplication of stylesheet information.

Thanks

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