ALV Grid works in normal screen but not in modal

Hi,
I'm struggling with an alv control I've created.  I need to have it displayed in a modal dialog window.  It works fine in a "normal" window but when I change the screen to be modal nothing displays.
Anyone have any ideas or hit this issue before.
Screen is defined in a function group with a custom control.
Classes exist for model / view and ws.
A function module creates classes above and passes a container to the view class which creates an instance of CL_GUI_ALV_GRID.  Function module then executes:
call screen 100 starting at 5 5.    -  ALV doesn't display
Call screen 100.                        -  Works fine

Helps if you populate the custom control after you have called the screen not before !

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