LGTM
http://gwt-code-reviews.appspot.com/1421807/diff/1/user/src/com/google/gwt/uibinder/rebind/AbstractFieldWriter.java File user/src/com/google/gwt/uibinder/rebind/AbstractFieldWriter.java (right): http://gwt-code-reviews.appspot.com/1421807/diff/1/user/src/com/google/gwt/uibinder/rebind/AbstractFieldWriter.java#newcode189 user/src/com/google/gwt/uibinder/rebind/AbstractFieldWriter.java:189: && getAssignableType().isAssignableTo(attachableHTMLPanelType); Ha! http://gwt-code-reviews.appspot.com/1421807/ -- http://groups.google.com/group/Google-Web-Toolkit-Contributors