How to add a custom button and plugin to tinymce in Umbraco 4.5

Last week I had to create some custom functionality for the tinymce editor in Umbraco. We needed to add a style-based expand/collapse dhtml region for some proof of concept code. I looked for information on customizing the editor in Umbraco 4.5 and could only find bits and pieces. So a coworker and I figured it…

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