Hello Prasad,
You can write the script to display off drop down arrow button when the saveAs button is clicked, by following three steps
1) First you write script in the Click event :-
app.execMenuItem("SaveAs");
Then you write the script in the mouseDown event:-
if (xfa.event.name == "mouseDown")
{
DropDownList1.presence = "hidden";
}
2) Save as the form in dynamic mode
3) Then select File> Form Properties> Defaults> then select "Automatically" from "preserve scripting changes to form when saved:".
Thanks,
Debadas.