I did something like this:

SimplePanel modalDiv = new SimplePanel(new HTML(" "));
modalDiv.setStyleName("modalDiv");
modalDiv.setWidth("100%");
modalDiv.setHeight("100%");

RootPanel.get().add(modalDiv);

DOM.setStyleAttribute(modalDiv.getElement(), "position", "absolute");
DOM.setStyleAttribute(modalDiv.getElement(), "left", "0");
DOM.setStyleAttribute(modalDiv.getElement(), "top", "0");

with css:

.modalDiv {
  filter:alpha(opacity=90);
  -moz-opacity:.90;
  opacity:.90;
}

-luke

On Mar 18, 12:34 am, Saeed Zarinfam <[email protected]> wrote:
> Hi
> I want to mask page element when i show a dialog box over the page
> (like google reader message box).
> please guide me.
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