OO ABAP having problems retrieving value from screen dropBox field

Hi,

I am a new in ABAP, and need some advice.

I have a class and in its definition I  have class-data: dropBox (same name as in screen) field from the screen. When I create a instance of a class and fill with data dropBox. data is populated properly using F4IF_INT_TABLE_VALUE_REQUEST method. But I can not retrieve the selected value. In screen dropBox field 'conversion exit' is set to ALPHA.

Tried to do it without a class it works, and I can get data.

Question is, can I do it using a class the way I explaining at the beginning of discussion.

Am I missing something?

Thanks,

Aivaras