I found in gwt 2.4, the ImageCell Class is 
 
interface Template extends SafeHtmlTemplates{
   @Template ("<img src=\"{0}\"/>">
   SafeHtml img(String url);
}

so it will rise the warning
"Template with variable in URL attribute context:The template code 
generator cannot guarantee HTML-safety of the temp;ate --........"
so to eliminate this warning, need extend the GWT 2.4 ImageCell Class?

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