# CKEditor Samples » Using the Developer Tools Plugin

This sample is not maintained anymore. Check out its brand new version in CKEditor SDK.

This sample shows how to configure CKEditor instances to use the Developer Tools (`devtools`) plugin that displays information about dialog window elements, including the name of the dialog window, tab, and UI element. Please note that the tooltip also contains a link to the CKEditor JavaScript API documentation for each of the selected elements.

This plugin is aimed at developers who would like to customize their CKEditor instances and create their own plugins. By default it is turned off; it is usually useful to only turn it on in the development phase. Note that it works with all CKEditor dialog windows, including the ones that were created by custom plugins.

To add a CKEditor instance using the devtools plugin, insert the following JavaScript call into your code:

    CKEDITOR.replace( 'textarea_id', {
    	extraPlugins: 'devtools'
    });

Note that `textarea_id` in the code above is the `id` attribute of the `<textarea>` element to be replaced with CKEditor.

Editor 1: <p>This is some <strong>sample text</strong>. You are using <a href="http://ckeditor.com/">CKEditor</a>.</p>