All of the Coral Tools that have a User Interface window are built using the same UI library. As a result they all have similar behaviors (minimize/restore, drag, expand/collapse, status bars) and have the same properties available for setting their look & feel (colors, styles, display options). I have created a library of set files that contain only the properties for setting these styling inputs, which can be loaded into any Coral product with a UI to set the same properties. If you're running multiple tools in the same MT4 it can be really pleasant to have the products all using the same display properties; it creates a more unified kind of experience.
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You load these set files the same way as any other set file, but they do not contain the full set of options for any tool, just the properties for the UI library. Just load whatever set file you want to use in a tool first, and then load the skin file second to apply the colors and styles you want.