Can't add Dynamic Pages in front of Component Selection Page

I try to add Dynamic pages out of a Component Script constructor as follows:

function Component(){
    if(installer.isInstaller()){
        ...
        installer.addWizardPage(component, "Page", QInstaller.ComponentSelection);
       ...
    }
    else{
        ...
        installer.addWizardPage(component, "Page", QInstaller.ComponentSelection);
        ...
    }
}

The page shows up for the Installer but not for the Maintenance Tool. How ever, the page shows up in the Maintenance Tool if i change QInstaller.ComponentSelection to QInstaller.ReadyForInstallation.

Could you please have a look on this and let me know about your results?

Cheers,
vanJogt