Unable to add item in Finder’s contextual menu using services in Cocoa

Question or issue on macOS:

I would like to add an item in my Finder’s contextual menu whenever I right-click on files or folders, and this menu being linked to a method of my Cocoa app.
I am following CocoaDev’s example and Apple’s documentation, but I can’t get the service being displayed.
Here is my .h

#import 

@interface AppDelegate : NSObject 

@property (assign) IBOutlet NSWindow *window;
-(void)IClicked:(NSPasteboard *)pboard 
             userData:(NSString *)data
                error:(NSString **)error;

@end

.m

#import "AppDelegate.h"

@implementation AppDelegate
@synthesize window = _window;
- (void)applicationDidFinishLaunching:(NSNotification *)aNotification
{
    [NSApp setServicesProvider:self];
}

- (void)IClicked:(NSPasteboard *)pboard userData:(NSString *)data error:(NSString **)error
{
    NSLog(@"I clicked");
}

@end

and the extract of my Application-plist.info:

NSServices

    
        NSKeyEquivalent
        
            default
            E
        
        NSMenuItem
        
            default
            My Application
        
        NSMessage
        IClicked
        NSPortName
        TestService
        NSSendFileTypes
        
            public.item
        
        NSSendTypes
        
            NSPasteboardTypeString
        
        NSRequiredContext
        
            NSServiceCategory
            public.item
        
        NSReturnTypes
        
            NSPasteboardTypeString
        
    

I uploaded the code to http://www.petits-suisses.ch/TestService.zip.

What did I wrong, or is there any available Cocoa code I can download to understand what I did wrong ?

Thanks !

How to solve this problem?

Found the issues:
1. I really had to store my application at least once into the Applications folder (which is not done by default when you compile with Xcode)
2. Should have added NSUpdateDynamicServices(); after the [NSApp setServicesProvider:self]; command.
3. Wait roughly 10 secs after having started the app to get Finder’s Services menu populated.

Hope this helps!