Using a Webview in a modal NSSheet - objective-c

Question

I am having an issue similiar to this SO question. I would like to have a webview in an NSSheet in which I am doing some authentication to retrieve an API token.
I created a new NSWindowController subclass with a corresponding xib file. This is how I am starting the NSSheet:
- (IBAction)startAuthentication:(NSButton *)sender {
self.authController = [[AuthenticationWindowController alloc] initWithWindowNibName:#"AuthenticationWindow"];
[[NSApplication sharedApplication] beginSheet:self.authController.window
modalForWindow:[self.exportManager window]
modalDelegate:self
didEndSelector:#selector(sheetDidEnd:returnCode:contextInfo:)
contextInfo:nil];
}
In the windowDidLoad callback of this authenticationWindowController I am directing the webview to the URL:
- (void)windowDidLoad
{
[super windowDidLoad];
[[self.webView mainFrame]loadRequest:[NSURLRequest requestWithURL:authURL]];
}
It looks great at first sight: if I press the button, the startAuthentication action method is called and the new window is animated into the parent window and the authURL is loaded. The website is displayed correctly with its HTML form containing two input fields (username and password).
The problem is, that I can click on the page and it works, however if I am trying to click into one textfield, so that this field gets focus it does not work. No cursor appears in the text field of the website's form and after each keystroke I hear the NSBeep() sound.
I did some research on this topic and I found two references:
How do I use a WebView in a modal dialog?
Cocoa topics: the case of the modal WebView
What kind of puzzles me is that there is the Facebook Exporter for Aperture Plugin, which shows exactly what I want: a webview in a modal sheet. However I cannot find out what they are making differently . In the Facebook Exporter I have not found any code interacting with the run loops directly.
My questions
Is this a known problem with webviews in modal sheets?
Are the problems explained in the two references still there?
How can I get this working? I do not understand when to switch the runloop mode for example.

Answer 1

there is no general problem with this and I just tried it out again. must be some code besides this? can you narrow it down to the sheet? btw: my sample:
https://dl.dropbox.com/u/3753090/test2.zip
BUT all that said, modal runmode and webviews / timers / networking isnt very waterproof :)
because: when you go modal via one of the convenience methods in NSApp, the runloop is only run in a very limited way. :/