How To Prevent expanding JQuery BlockUI Dialog

how do i prevent expanding the jquery blockui dialog box? i thought draggable: false? but that does not work.

// this is 开发者_运维技巧essentially the default dialog if not overriden
    initDialog: function(e) {
        // modify timeout to do jquery dialog
        if (typeof jQuery.ui != 'undefined') {
            var _session = this;
            $("#" + this._clientId).dialog({
                autoOpen: false,
                bgiframe: true, draggable: false,
                modal: true,
                buttons: {
                    Ok: function() {
                        $(this).dialog('close');
                        CallServer();
                            }
                }
            });
        }

I might have misread your question, but is resizable what you're after?

resizable: false,