FormPanel setEncoding not working in IE(7)

[Kai Krupka]

I'm trying to upload a file working with a FormPanel and FileUpload on the client side (application using GWT 2.3). Before submitting the method (post) and the action (url) is set. With these two options it's working and the request reaches the servlet in the server side. However, whenever I set the encoding with form.setEncoding(FormPanel.ENCODING_MULTIPART) the request never reaches the servlet. In other browsers like Chrome and FF it's working without any problems, not in the Internet Explorer (7). Has anyone an idea fixing that problem? Thanks.