How to find XPath of an ExtJS element with dynamic ID

All the elements in the application which i am testing have dynanic ID's . The test always passes when i replay it without refreshing the page but as soon as i refresh the page, The Test Fails because Id's of all the elements changes randomly and selenium cannot match the recorded id's with the new ones .

I tried to use Xpath-position, It works for some objects but in case of Dropdown list and Buttons, it dosent work!

Can anyone please tell me how to find the Xpath (Meathods in JAVA or S*elence*) of an object OR How to create a new Locator Finder for Dropdown list and Buttons

I can show the properties (Inspected by Firebug) of the dropdown which is teasing me.

properties of Dropdown :

<div id="ext-gen1345" class="x-trigger-index-0 x-form-trigger x-form-arrow-trigger x-form-trigger-last x-unselectable" role="button" style="-moz-user-select: none;"></div>

properties of Dropdown*Choice*:

<ul>
    <li class="x-boundlist-item" role="option">Rescue</li>
</ul>

Yi Zeng

Please search before posting, I have been answering this over and over.

ExtJS pages are hard to test, especially on finding elements.

Here are some of the tips I consider useful:

Don't ever use dynamically generated IDs. like (:id, 'ext-gen1345')
Don't ever use absolute/meaningless XPath, like //*[@class='someclass']/li/ul/li[2]/ul/li[2]/table/tbody/tr/td[2]/div
Take advantage of meaningful auto-generated partial ids and class names. (So you need show more HTML in your example, as I can make suggestions.)

For example, this ExtJS grid example: (:css, '.x-grid-view .x-grid-table') would be handy. If there are multiple of grids, try index them or locate the identifiable ancestor, like (:css, '#something-meaningful .x-grid-view .x-grid-table'). In your case, (:css, '#something-meaningful .x-form-arrow-trigger')
Take advantage of button's text.

For example, this ExtJS example: you can use XPath .//li[contains(@class, 'x-boundlist-item') and text()='Rescue']. However, this method is not suitable for CSS Selector or multi-language applications.
The best way to test is to create meaningful class names in the source code. If you don't have the access to the source code, please talk to your manager, using Selenium against ExtJS application should really be a developer's job. ExtJS provides cls and tdCls for custom class names, so you can add cls:'testing-btn-foo' in your source code, and Selenium can get it by (:css, '.x-panel .testing-btn-foo').