The created command directory does not appear

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1

Dear all,
I have created a new command directory with G4UIdirectory as the bellow:

MyMessenger::MyMessenger(MyController * control)
    :controller(control)
{
    controller = control;
    gammaknifeDir = new G4UIdirectory( "/gammaknifeCtrl/");
    gammaknifeDir->SetGuidance("Commands related to the GammaKnife model");
    beamOnCommand = new G4UIcmdWithAnInteger( "/gammaknifeCtrl/beamOn", this);

MyMessenger::~MyMessenger()
{
    delete beamOnCommand;
    delete gammaknifeDir;
}

void MyMessenger::SetNewValue(G4UIcommand * cmd, G4String newValue)
{
    if (cmd == beamOnCommand)
    {
        controller->BeamOn( beamOnCommand->GetNewIntValue( newValue ) );
    }
}

There are none of the errors when I build the source code. But I can not find this command. Can anyone help me, plz?
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