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

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Width
The width of the thumbnails, in pixels.
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Height
The height of the thumbnails, in pixels.
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Space
The width of space between thumbnails.
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Color
The background color of the thumbnails.
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Visible
A Boolean value that indicates whether the thumbnails bar is visible.
Background
Marker
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Border width
The width of the border of the marker, in pixels.
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Color
The color of the thumbnails.
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Transparent
Indicates the alpha transparency value of the marker. Valid values are 0 (fully transparent) to 1 (fully opaque).