You can disable specific filters from the code. For example:
sender, EventArgs e)
Unfortunately, some of the "bad" HTML is corrected by the browser engine even before it gets to the editor filters and there is nothing you can do about it. For example, if you forget to close a <div> tag, it will be closed regardless of what filters you have enabled in the editor. Each browser has its own HTML engine but they all share the "auto-correcting" feature for invalid content.
If you need to change the content of the editor and be sure that the changes won't be reversed, the only place you can do that is on the server, before saving the editor content:
content = RadEditor1.Content;
All the best,
the Telerik team
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