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// close dialog by overlay click

$.widget(
    'ui.dialog',
    $.ui.dialog,
    {
        _createOverlay: function()
        {
            this._super();

            if (!this.options.modal)
            {
                return;
            }

            this._on(this.overlay, { click: 'close' });
        }
    }
);

// http://stackoverflow.com/questions/19690131/jquery-ui-modal-dialog-global-close-on-overlay-click
// https://gist.github.com/jurchiks/7264596