Set focus to xfa.host.response dialog box

Hi,

in my form i do have an xfa.host.response dialog password box:

var sPassword = xfa.host.response("Please enter your password:", "Password", "", true);

I'm wondering now if there is no possibilty to directly set the cursor focus into the pop up password box. To work with xfa.host.setFocus(somExpression) seems to be not possible because the dialog box has no somExpression, right?

Any suggestions?

Thanks!