Load an URL into a webview from outside the application does not work

I'm trying to load an URL into a webview from outside the application. I've set my info.plist 开发者_如何学Pythonproperly to support http, https. My app appear in the handler list (safari preference pan). Here is my code

I have this in my awakefromnib

        NSAppleEventManager *em = [NSAppleEventManager sharedAppleEventManager];
    [em 
     setEventHandler:self 
     andSelector:@selector(getUrl:withReplyEvent:) 
     forEventClass:kInternetEventClass 
     andEventID:kAEGetURL];

And then

//get the URL from outside the application
- (void)getUrl:(NSAppleEventDescriptor *)event 
withReplyEvent:(NSAppleEventDescriptor *)replyEvent
{

    // Get the URL
    NSString *urlStr = [[event paramDescriptorForKeyword:keyDirectObject] 
                        stringValue];

    [self initWithUrl:urlStr]; 
}

//Can be used as intializer to init the webview with a page
-(void)initWithUrl:(NSString *)url
{
    //load the lading home page
    [[webview mainFrame] loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:url]]];



}

If i nslog the url it show it (so it properly get it). My next method is also called. This method work fine from inside my app.

The problem is that when I click in a link outside of my app (once the app is selected as default browser). I popup the window but it not load the URL. It just does nothing. Any idea ?

What is the "mainFrame" method of webview? Is that a custom class? Did you add the web view's frame to the window's frame?