How to open Modify Expression dialog box at runtime?
NOTE:
Two different types of dialog boxes to specify expression are there in PowerBuilder.
- SetFilter() function opens "Specify Filter"
- Double click on a column from list of sort columns opens "Modify Expression"
The difference is comparison operators (= , >, < <> ....) are not needed in "Modify Expression" dialog box but SetFilter(null_str) open up "Specify Filter" dialog box that require comparison operators use in expression.