to uncheck checkbox when other checkbox is checked, vice-versa AX 2012
in a dialog
put code in UIbulder class.

public void postRun()
{
    super();

    dialog.dialogForm().formRun().controlMethodOverload(false);

    noRouteVersion.registerOverrideMethod(methodStr(FormStringControl, modified), methodStr(AMPHRouteExceptionReportUIBuilder, noRouteVersionModified), this);
}
-----
public boolean noRouteVersionModified(FormStringControl _control)
{
    boolean             ret;
    LedgerPeriodCode    ledgerPeriodCode;

    ret = _control.modified();

    if (ret)
    {
-code / condition-
    }

return ret;

}