Thumbnails
In 'Thumbnails' category of the Wizard (Right click on Flash Object, then FlashDevlopment24 Wizard -> Advanced Image Gallery) you can customize the appearance of the thumbnails.

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Maximum size
The size of a thumb, in pixels. If you set "-1" thumbs will be represented in their original proportions.
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Space width
The space width between thumbs, in pixels.
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Background color
The background color of thumbs.
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Shadow
A Boolean value that indicates whether the thumbs have shadow (true) or not (false).
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Border thickness
The width of the thumbs border, in pixels.
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Border color
The border color of thumbs.
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Border transparent
Indicates the alpha transparency value of the thumbs border. Valid values are 0 (fully transparent) to 1 (fully opaque).
Background panel
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Thickness
The width of the thumbs panel, in pixels.
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Align
The align of the thumbs panel. Acceptable values are "Left", "Right", "Top" and "Bottom".
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Fixed position
A Boolean value that indicates whether the thumbs panel hides (false) or not (true).
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Padding
The padding between thumbs and the edge of the thumbs panel, in pixels.
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Color
The color of the thumbs panel.
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Transparent
Indicates the alpha transparency value of the thumbs panel. Valid values are 0 (fully transparent) to 1 (fully opaque).
Control line
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Thickness
The width of the drop line of the thumbs panel, in pixels.
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Color
The color of the drop line of the thumbs panel.
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Transparent
Indicates the alpha transparency value of the drop panel of the thumbs panel. Valid values are 0 (fully transparent) to 1 (fully opaque).
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Arrow color
The color of the drop line arrow.
Captions
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Maximum width
The width of the droping caption for thumbs, in pixels.
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Margin
The margins between font and the edges of the droping caption for thumbs, in pixels.
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Background color
The background color of the droping caption for thumbs.
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Backgronud transparent
Indicates the alpha transparency value of the background of the droping caption for thumbs. Valid values are 0 (fully transparent) to 1 (fully opaque).
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Font
The font family of the droping caption for thumbs.
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Font size
The font size of the droping caption for thumbs.
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Font color
The font color of the droping caption for thumbs.
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Arrow color
The arrow color of the droping caption for thumbs.