Add Remove Theme Files
RadThemeManager cannot load the theme if it is saved as package (tssp file). This is shown in the following article: using custom themes To edit the list of themes loaded into a Theme Manager, follow these steps:
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Select the RadThemeManager control, and then open its Smart Tag menu.

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Select Edit Themes to open the ThemeSource Collection Editor.

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Click OK when you are finished working in the editor.
To Add a New Theme to the Theme Manager
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Click Add.
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Choose the StorageType for the theme. Select Resource or File.
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Set the ThemeLocation (resource name or file location).
To Remove a Theme from the Resource Manager
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Select the theme that you wish to remove.
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Click Remove.
To Change the Properties for an Existing Theme
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Select the theme that you wish to edit.
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Set the StorageType and ThemeLocation properties to your desired values.
When setting the ThemeLocation for a Resource storage type be sure to include the project namespace. The naming convention for ThemeManager to find the resource is <my project namespace>.<theme name>.xml. In project "MyProject" with theme resource file "MyTheme.xml", the fully qualified resource name should be entered as "MyProject.MyTheme.XML".