ALV Grid - Remove Drop Down List from specific fields

Hi,

This is in regards to the ALV Grid, which I output using Function Module REUSE_ALV_GRID_DISPLAY.

Many of the fields have a drop-down list (sort of like a box that appears on the right hand side when the field is selected.)

How can I remove this drop-down list option from the fields that have the option?

Please Help.

Thanks,

John