I want to use the functions ColumnSize, ColumnHeader, ColumnWidth for a certain table containing a comma in its title, e.g. "Wholesale, retail and miscellaneous products". But since GuiXT expects the column name after the comma, this is not possible. What is the solution?       

Abbreviate the table title, e.g. if you want to set column size  6 for the column "Material":
ColumnSize [Wholes.,Material]   6