Hi, Jorge -
Try using the LookUpDisplay() DataWindow expression function, inside of an Evaluate function, inside of a DataWindow Describe function, as follows:
String ls_display_value
ls_display_value = dw_1.Describe("Evaluate('LookUpDisplay(dept_id)',1)")
In the above code snippet, the column DWObject in the DataWindow that utilizes the Drop-down List Box (ddlb) edit style is named "dept_id". The row in the DataWindow that is to be evaluated is row 1, which is typical for free-form DataWindows.
Pay close attention to the use of apostrophes (single-quotes) and double-quotes, as the above statement requires you to code a string within a string.
Best regards, John