public void CGAButtonClicked()
        {
            switch (currentState)
            {
            case MainWindoViewState.VIEW1STATE:
                if (this.newEvent == MainWindowButtonClickEvents.CON_TO_SITE_CLK)
                {
                    this.nextState = MainWindoViewState.VIEW1STATE;
                }
                else if (this.newEvent == MainWindowButtonClickEvents.OPT_CLK)
                {
                    this.nextState = MainWindoViewState.VIEW2STATE;
                }
                else if (this.newEvent == MainWindowButtonClickEvents.ABT_ME_CLK)
                {
                    this.nextState = MainWindoViewState.VIEW3STATE;
                }
                else
                {
                    //next state is null
                }
                if (this.nextState != this.currentState)
                {
                    MainWindowEventArgs args = new MainWindowEventArgs(this.nextState, currentState);
                    OnMainwindowStateChanged(args);
                }

            case MainWindoViewState.VIEW2STATE:
            }
        }
        protected virtual void OnMainwindowStateChanging(MainWindowEventArgs e)
        {
            MainWindowButtonEventHandler handler = MainWindowButtonClick;

            if (handler != null)
            {
                handler(this, e);
                this.currentState = this.nextState;
                this.nextState    = null;
            }
        }
 public MainWindowVS()
 {
     currentState = MainWindoViewState.NULL;
     nextState    = MainWindoViewState.NULL;
 }