For testing the correct behavior, took some examples from ExtJS's and adjusted widgets for RTL support.
To enable the support, put the files under src on your web server, and add them to the head section, right after ExtJS section. for example:
<script type="text/javascript" src="some_path/extjs_rtl.js"></script>
<link rel="stylesheet" type="text/css" href="some_path/resources/css/extjs_rtl.css"/>Don't forget to apply RTL for your page, for example adding dir="rtl" to body. See the examples folder for more info.
Meir Kriheli <meir@mksoft.co.il>