You need need to create a file named "DexedTheme.xml" and it must be placed in the same directory where "Dexed.xml" is created. On Windows, this is C:\Users\\<yourusername>\AppData\Roaming\DigitalSuburban" and on Mac it is "~/Library/Application Support/DigitalSuburban"
Colour id are analogous to JUCE color ID; see [DXLookNFeel() class](../Source/DXLookNFeel.cpp) for a complete list a defined colours id. Colour value is the hexa decimal values (from 0 to 0xFF) for ALPHA RED BLUE GREEN.
Image id are the file name defined in [ui folder](../Resources/ui). If it cannot find the file, the image will no longer be rendered. The image path is relative to the path where "DexedTheme.xml" is defined.