Hide/Visible display method in form

Hi all,

I will use customized form.That have one checkbox field.If checkbox is Yes means i want to show two fields in form grid.Checkbox is No means hide two fields in grid.Here one field is String other one is Display method.

I will hide the string field like ds.object(DataSource,field).visible(false); in form active method.

My question is how to did the above situation in display method.

Anyone suggest Please.

Thanks.