Toolbar customization palette dosn't display default image

Question

I have an application which calls runCustomizationPalette.

In my application I add my tools to the NSToolbar and then I set one of them not to be displayed by default.

The toolbar is set to display both image and text.

When I run the application everything works as expected - the tool that turned off is not displayed. But when I call the function, palette is displayed, but the tool that is turned off shows in the palette with Text Only - no image is displayed.

When I remove the default button removal and display all the buttons in the toolbar and display the customization palette - everything is displayed as it should.

My question would be - what is controlling the display of the images in the Customization Palette?

TIA!!

EDIT:

This is the code for toolbar creation:

    NSToolbar* tb =  [[wxNSToolbar alloc] initWithIdentifier:cfidentifier.AsNSString()];
    [tb setAllowsUserCustomization:YES];
    [tb setAutosavesConfiguration:YES];
    NSToolbarDisplayMode mode = NSToolbarDisplayModeDefault;
    NSToolbarSizeMode displaySize = NSToolbarSizeModeSmall;

    if ( style & NOICONS )
        mode = NSToolbarDisplayModeLabelOnly;
    else if ( style & TEXT )
        mode = NSToolbarDisplayModeIconAndLabel;
    else
        mode = NSToolbarDisplayModeIconOnly;

    [tb setDisplayMode:mode];
    [tb setSizeMode:displaySize];

What am I missing? It should be something really simple like some ind of style...