Drop BlogPosts control on a page. Then drop CategoriesTree
control on the same page. Do not use CategoriesList control.
Then set the following properties of CategoriesTree control
ProviderName - Blogs
CategoryContentUrl - url to the page where BlogPosts control has been dropped.
CategoryKey - BlogCatID
CategoryKeyType - ID
You may find the following blog post useful - Filter CategoriesTree control by blog
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