For instance if you want to enable it for ContentBlock control you can map the template of the GontentBlock designer from Sitefinity's configuration ( take a look at attached screenshot) and then set the property of theHtmlField control. Then you can set ToolsFile property of the RadEditor ]\
htmlEditor.Editor.ToolsFile = "~/Controls/ToolsFile.xml";
where you have <tool name="FormatBlock" /> tool added.
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