To customize the palette window's toolbar, control-click on the toolbar and choose Customize Toolbar. A sheet will open containing buttons you can add by dragging them into the toolbar. While the customization sheet is open, you can rearrange items on the toolbar by dragging them around or remove items by dragging them out. Each installed palette will be available as a button that can be added to the toolbar to make that palette easily accessible.
The following items are also available for use on the palette window toolbar:

Palettes
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Allows you to quickly switch among loaded palettes.
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Edit Palette
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Click on this to edit the current palette.
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Previous
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Cycles backwards through the list of palettes that have been viewed.
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Next
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Cycles forwards through the list of palettes that have been viewed.
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New
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Click this button to create and edit a new palette.
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