ColorBlock                                       (Assignable)

        Contains an optional code block that determines the color of data
        items as they are displayed.  If present, this block is executed each
        time a new value is retrieved via the TBColumn:Block (the data
        retrieval block).  The newly retrieved data value is passed as an
        argument to the TBColumn:ColorBlock, which must return an array
        containing two numeric values.  The values returned are used as
        indexes into the color table of the TBrowse object as described in
        the TBColumn:defColor reference below.

        The TBColumn:ColorBlock allows display colors for data items based on
        the value of the data being displayed.  For example, negative numbers
        may be displayed in a different color than positive numbers.

        oTBCol:ColorBlock := {|x| IF(x < 0, {5,2},;
                                IF(x > 0, {8,2}, {4,2}))}