public static void Exec(MercatorUi.MovableControls.MovableButton clickedButton)
{
    // enter your customized code here
    MercatorUi.Forms.Sig.SigForm sigForm = (MercatorUi.Forms.Sig.SigForm)clickedButton.Form;
    ((MercatorUi.Sig.SigStock)sigForm.Sig).RecomputeNomenclature(sigForm, "S_DPA", 2, whereClauseOnArtLiens: "artliens.mycondition = 1");
}