title: WebDriver - wait until invisibility of element
body: <p>i have element defined in page page factory</p>
  
  <pre><code>@FindBy(xpath = "//*[contains(@style,'gxt/images/default/tree/loading.gif')]")
  WebElement treeLoading;
  </code></pre>
  
  <p>i would like to wait for this element to disappear and ExpectedConditions does not support invisiblityOfElementLocated(WebElement), is there any better approach to write custom wait?</p>