Hi Ced, they aren't drop shadows, they are the <moi:PaletteBody> elements that contain the command buttons. When the palette is not active, the content is hidden and the <moi:PaletteBody> will be small. Basically it's the same thing with border and background that you see when you activate a palette, when a tab is activated the content inside the <moi:PaletteBody> is displayed and then the "drop shadow" grows larger.

If you want to get rid of those you'll need to modify the script code that handles clicking on a palette tab, it's the function HandleTabChange() inside the SidePaneTabs.js file.

- Michael