Make UKNibOwner work with classes in frameworks/plug-ins as well

We fall back on the main bundle if our bundle doesn't contain the requested NIB file.

UKNibOwner.m

@@ -64,10 +64,16 @@ -(id)	initWithNibName: (NSString*)nibName owner: (id)owner
 									owner, @"NSOwner",
 									topLevelObjects, @"NSTopLevelObjects",
 									nil];
-		NSBundle*		mainB = [NSBundle mainBundle];
+		NSBundle*		mainB = [NSBundle bundleForClass: [self class]];
 		if( nibName )
 			[mainB loadNibFile: nibName externalNameTable: ent withZone: [self zone]];	// We're responsible for releasing the top-level objects in the NIB (our view, right now).
 		if( nibName && [topLevelObjects count] == 0 )
+		{
+			mainB = [NSBundle mainBundle];
+			if( nibName )
+				[mainB loadNibFile: nibName externalNameTable: ent withZone: [self zone]];	// We're responsible for releasing the top-level objects in the NIB (our view, right now).
+		}
+		if( nibName && [topLevelObjects count] == 0 )
 		{
 			NSLog(@"%@: Couldn't find NIB file \"%@.nib\".", NSStringFromClass([self class]), nibName);
 			[self autorelease];