Display Resizable Amodal Pop-up Dialog Box

Did you ever have a requirement to display resizable pop-up window or amodal pop-up window? Or are you aware that we cannot have a resizable dialog box using normal CALL SCREEN technique? Honestly I’m just aware of it and just found out how ABAP can display a resizable amodal pop-up dialog box just like the F4 search help window (you may notice some F4 windows from SAP transactions are actually amodal instead of modal). Let me try to describe further and create a generic code template for this purpose so you may use it in your program. Any correction and feedback are most welcome.