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How to grab the Scroller of a WebView?

I saw a few similar questions around. But none answered my problem. I have a WebView and want to change the width/color/location of the associated scroller.
I implemented a WebView delegate and try to get the "enclosingScrollView" in the awakeFromNib, but that fails:

--------

@implementation WebView (ENExtras)

- (void) awakeFromNib
{	
	[self setFrameLoadDelegate: self];

	NSLog(@"%@", [[self mainFrame] frameView]);
	NSLog(@"%@", [[[self mainFrame] frameView] webFrame]);
	NSLog(@"%@", [[[self mainFrame] frameView] documentView]);

// What I want to get
NSScrollView *scrollView = [[[[self mainFrame] frameView] documentView] enclosingScrollView];
}

[...]
---------

returns:

2006-04-10 14:50:35.939 MyApplication[4738] <WebFrameView: 0x164c55d0>
2006-04-10 14:50:35.939 MyApplication[4738] <WebFrame: 0x164a6470>
2006-04-10 14:50:35.939 MyApplication[4738] (null)

--------

Could someone let me know why I can't get the documentView? Much appreciated!
I tried doing this from the Controller object calling the WebView object from there rather than the 'self' but I get the same problem. When if not in the awakeFromNib should I do this? These are settings to be called once.

Thank you!

Tristan
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