public class MyCustomApplication extends ProjX 
{
    private List<Throwable> liErrors = null;
   
    public MyCustomApplication(UILauncher pLauncher) throws Throwable 
    {
        super(pLauncher);
    }
    
    public void handleException(Throwable pThrowable)
    {
        if (liErrors == null)
        {
            liErrors = new ArrayUtil<Throwable>();
            
            invokeLater(this, "showErrorMessage");
        }
        
        liErrors.add(pThrowable);
    }    

    public void showErrorMessage()
    {
        String message = ExceptionUtil.getRootCause(liErrors.get(0)).getMessage();
        
        for (IWorkScreen screen : getWorkScreens())
        {
            if (screen instanceof IErrorHandler)
            {
                ((IErrorHandler)screen).showErrorMessage(message);
            }
        }
        
        liErrors = null;
    }
}