Derived column: cannot change data type of a column

HI, whenever I create a new column in a derived column transform, I cannot change its data type even though it is a brand new column (does not replace another one). This was possible in SSIS 2005 without explicitly casting the column.  Now, whenever I add a string column, it's type is automatically unicode string. If I want to have a non unicode string datatype, I need to cast the value explicitely (DT_STR, 50, 1252). Is this fucntionnality been removed in SSIS 2008?

Thank you,

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