XTREE enhancement: Constant data columns, whose data is the same in every cell, may now be defined independently of the data array. This is most useful for columns that contain "buttons", such as an "delete item" button on every row, but in theory could be used for anything. To define such a column, set the cpos and cformat parameters to -1. The data for column is defined via a new Advanced Coldef Option Data=<text>, where <text> specifies the text that would normally come from the data array.
For example, you can define a column of delete "buttons" as follows:
coldef += "-1~-1~Del~I~ImgSiz=16,16,24~ImgCount=1~" "Data=delete2::ashico1~ClickExit=-300,0~~"
