if the element is added to the page by javascript code, it could be that it's simply
not there yet when you run the search (this is a common case for GWT applications,
which dynamically modify the page after it's loaded).
Please provide a test case if using WebDriverWait does not help.

The problem was that this element contain's in iframe. When I used selenium 1 it work
without forse selecting this frame. But when I use selenium 2 webdriver it needs to
select that iframe first and than click element.

So, the problem in different determining in selenium 1 and 2.

P. S. : the timeouts were used.

I have run into a similar issue, only in my case it is not related to performing a click
using Xpath, but rather a getText.  

Selenium 1/RC seems to go through all frames (some are even frames nested in frames)
when using XPath; while Selenium 2 WebDriver does not.  

Is this potentially a "bug" in how the WebDriver works or is this just a functional
difference that I'll need to work through.

Additional info.  I am attaching the jsp source files for the sample page I have created
to assist me with trying to work through a solution.

Basically, a page with three iframes 1, 2, 3 where frame 3 is embedded in frame 1.

Under RC these statements work fine and pull the expected text (Special Request$xxx,xxx)..Note,
I made a distinction Selenium 1/RC above and I am really running the RC included with
the Selenium 2 jars.  I guess this is still considered 1?

selenium.getText("//div[contains(@id,'frame1')]");
selenium.getText("//div[contains(@id,'frame2')]");
selenium.getText("//div[contains(@id,'frame3')]");

where as similar statements under web driver fail
driver.findElement(By.xpath("//div[contains(@id,'frame1')]"));
driver.findElement(By.xpath("//div[contains(@id,'frame3')]"));

org.openqa.selenium.NoSuchElementException: Unable to locate a node using //div[contains(@id,'frame1')]
For documentation on this error, please visit: http://seleniumhq.org/exceptions/no_such_element.html
Build info: version: '2.4.0', revision: '13337', time: '2011-08-12 09:58:05'

I have recorded the script using IDE and ExportedAs Junit4(Webdriver),Junit(Backed Selenium).
While observing from both exported test cases webdriver unable to find the frames.
My problem is the script working fine while play it by using IDE but its getting failed
while executing the exported script. Please help me to solve the issue.

//--Unable to find this below frames 
selenium.selectFrame("relative=up"); 
selenium.selectFrame("PWGadget1Ifr"); 

Thanks & Regards,
Sreenu..

I'm not sure about RC, but in WebDriver you have to switch to a frame (or an iframe)
explicitly.

I'm closing this as 'Working as intended'. Please feel free to reopen if it is still
an issue.