title: GWT Textbox with drop-down arrow
body: <p>I want to have a drop-down arrow in a textbox (actually SuggestBox in my case). GMail does this for advanced search functionality, (opens the advanced search dialog box). </p>
  
  <p>What would be the proper GWT layout to have this arrow show up in the right-hand-side of the TextBox and be clickable?</p>
  
  <p>Looking at GMail, I find a really odd image for the drop-down.</p>