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Question

How can I specify different styles and templates for different Themes/Color Schemes for my custom controls?

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Answer

There are two options:

You can place the Theme/Color Scheme resources in the assembly containing the custom control.

OR

You can place the Theme/Color Scheme resources in an external assembly.

For the first option, you need to set the first parameter of the [assembly: ThemeInfo()] attribute located in the "properties/AssemblyInfo.cs" file of your project to the ResourceDictionaryLocation.SourceAssembly value.

For the second option, the same parameter for the same attribute needs to be set to the ResourceDictionaryLocation.ExternalAssembly value. This will cause the theme/color scheme to be searched in a separate assembly, named after the source assembly and the theme.

The format of the name for the ExternalAssembly is "source_assembly_name.theme_name.dll"

Examples:

For a source assembly called "CustomControls.Buttons.dll"

CustomControls.Buttons.Luna.dll
CustomControls.Buttons.Royale.dll

Then, for either of the two options:

In the required assembly (source or external), you need to create a new ResourceDictionary, contained in its own independent XAML file, for each theme/color scheme you want to support.

You must name each of these files after the theme/color scheme it represents.

The format for the filename is "formal_theme_name.formal_color_scheme_name.xaml"

Examples:

luna.normalcolor.xaml
luna.homestead.xaml
luna.metallic.xaml
royale.normalcolor.xaml

Also, you must place the file in a "themes" folder directly in the assembly's project root (same location as the "generic.xaml" file when using ResourceDictionaryLocation.SourceAssembly).