protected void openProposalPopup(){
  openProposalPopup(false);
}

protected void openProposalPopup ( ) { openProposalPopup ( false ) ; }
open the proposal popup and display the proposals provided by the proposal provider . this method returns immediately . that is , it does not wait for a proposal to be selected . this method is used by subclasses to explicitly invoke the opening of the popup . if there are no proposals to show , the popup will not open and a beep will be sounded .
