class library field

I have a dialog screen with a text entry field (class library field).

After the first character I start a search and display a listview.

So far so good.

I want to have back the focus on that text entry field.

After the statement

SHOW-WINDOW WIN-MAT

I have the following statements

MOVE “SET-FOCUS” call-function(1)

CLEAR-CALLOUT-PARAMETERS $NULL

CALLOUT "matxtfld" 0 $NULL    (matxtfld is the modified efdemotxtfld.cbl)

It doesn’t work, maybe I have to add the Statement SET OBJECT-REF(1) , but to what?

Can someone give me a hint

Regards, Georg