openSubDialog( url, features, params )
- Return type: window
- Opens a child modal dialog. Usually this method would be used to allow the user to configure advanced options. The arguments are similar to the window's
openDialogmethod except that the window name does not need to be supplied. The <var>url</var> should be a XUL file. If the child dialog is also a
prefwindow, set its
childso that preferences will be saved properly when the main dialog is closed.