Regression in V27 regarding DCL dialog initialization

Please have a look at the following dcl definition:

Zellstatus_box :dialog {
label=" Zellstatus ";
:boxed_radio_column {
key="modus";
:radio_button { key="1"; label=" 1: &Aktiv"; }
:radio_button { key="0"; label=" 0: &Passiv"; }
:radio_button { key="-1"; label="-1: Passiv mit &vertikaler Durchleitung"; } spacer;
}
ok_cancel_help;
}

when initializing that dialog from ObjectARX using

ads_set_tile(regis,_T("modus"),_T("-1"));

it should set modus to the very last radiobutton, which worked fine til V26 (see png

)

In V27 Beta however it always sets the very first radio button, which is wrong (see png).

Best regards

Andreas