Open panel is permanently dead?

[Tom Davie]

Hi,

I'm having some problems with an open panel.  I display the panel, allow the
user to chose and image, and then do some work, which involves showing a
sheet while the work is done.  This all works wonderfully, until the user
clicks the "set texture" button again, and my method is called again.  The
second time, for some reason, the open panel is never displayed.

Can anyone tell what's going on here?  I've added code below:

- (IBAction)setTexture:(id)sender{
        NSOpenPanel 
<http://developer.apple.com/documentation/Cocoa/Reference/ApplicationKit/ObjC_classic/Classes/NSOpenPanel.html>
*panel = [NSOpenPanel
<http://developer.apple.com/documentation/Cocoa/Reference/ApplicationKit/ObjC_classic/Classes/NSOpenPanel.html>
openPanel];
        
        [panel setCanChooseFiles:YES];
        [panel setCanChooseDirectories:NO];
        [panel setResolvesAliases:YES];
        [panel setAllowsMultipleSelection:NO];
        [panel setTitle:@"Select Texture"];
        [panel setAllowedFileTypes:[NSArray
<http://developer.apple.com/documentation/Cocoa/Reference/Foundation/ObjC_classic/Classes/NSArray.html>
arrayWithObject:@"png"]];
        [panel beginSheetModalForWindow:[delegate windowForSheet]
completionHandler:^(NSInteger result)
        {
                 if (result == NSFileHandlingPanelOKButton)
                 {
                         NSURL 
<http://developer.apple.com/documentation/Cocoa/Reference/Foundation/ObjC_classic/Classes/NSURL.html>
*selection = [[panel URLs] objectAtIndex:0];
                         NSImage 
<http://developer.apple.com/documentation/Cocoa/Reference/ApplicationKit/ObjC_classic/Classes/NSImage.html>
*image = [[[NSImage
<http://developer.apple.com/documentation/Cocoa/Reference/ApplicationKit/ObjC_classic/Classes/NSImage.html>
alloc] initWithContentsOfURL:selection] autorelease];
                        
                         [self.item addObserver:self 
forKeyPath:@"textureIsCompressed"
options:NSKeyValueObservingOptionNew context:nil];
                         self.item.texture = image;
                        
                         [panel close];
                        
                         [NSApp beginSheet:compressingTexturePanel
                                modalForWindow:[delegate windowForSheet]
                                 modalDelegate:self
                                
didEndSelector:@selector(compressionSheetDidEnd:)
                                   contextInfo:nil];
                         [compressingProgress startAnimation:self];
                 }
        }];}

Thanks

Tom Davie
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