The selection filter in Claris CAD 2.0 will find pen colors. The selection filter will not find fill patterns with specific colors. Also, when using the selection filter, you must have the first 9 colors in the patterns bar set in the following order:
Transparent
White
Black
Red
Green
Blue
Yellow
Cyan
Magenta
If the first 9 colors are not set in this order, you will get an error message when trying to use color in the selection filter.