WebDriver GWT TabPanel Issue - gwt

Question

I'm trying to create a WebDriver Test for a GWT application which uses a TabPanel. Clicking on a tab works fine in the IDE (it uses the x-path to find the tab) however I cannot get the tab click working in the JUnit test.
All elements have a debugID including the Tabs (although tab id's do not appear to work even in the IDE) and I'm inheriting com.google.gwt.user.Debug. I've attempted to locate by Xpath which is the IDE default.
genericElement.findElement(By.xpath("//div[#id='gwt-debug-mainTabPanel']/div[2]/div/div[6]/div/div")
I've tried the code outlined in the documentation
genericElement.findElement(By.id("gwt-debug-mainTabPanel-bar-tab6")
I've also attempted a moveToelement(as clickAt is no longer supported) and click but that falls over too(unless I'm misunderstanding it). I'd also like to avoid this as it seems bad practice.
Actions builder = new Actions(driver);
genericElement = driver.findElement(By.id("gwt-debug-mainTabPanel"));
Action action = builder.moveToElement(genericElement,400, 370).click().build();
action.perform();
java.lang.UnsupportedOperationException: Moving to arbitrary X,Y
coordinates not supported.
I know GWT and Webdriver aren't getting along too well - but I feel like this will have a solution. Can anyone offer any help - has anyone implemented a working Webdriver test in which they click a tab in a GWT TabPanel?
EDIT
I've managed to locate the node using Firebug and xpath locators ( you can add /..to move to the parent gwt-TabLayoutPanelTabInner or add /../.. to mover to grandparent gwt-TabLayoutPanelTabInner and it should still work - it does in the IDE)
genericElement = driver.findElement(By.xpath("//div[contains(#class,'gwt-HTML') and contains(text(),'Users')]"));
However not the click doesn't change to the required tab - seems to be a known issue (likely don't need both moveToElement and click(genericElement) - hust giving it a shot)
Actions builder = new Actions(driver);
builder.moveToElement(genericElement).click(genericElement).build().perform();
See section 3 ....This is fun :)