If the button has a hilite attribute and that evaluates to false, then add 3px margin to the bottom
to make it line up with buttons that have hilite and eval to true. This makes it easy to have a
button in a repetition and only have on of those buttons have hilite, but all the buttons will line up.
*/
if (_styleBinding != null || _hiliteBinding != null || _isPlain) {
AWEncodedString userStyle = encodedStringValueForBinding(_styleBinding);
if (userStyle != null || _isPlain) {
AWResponse response = response();
response.appendContent(Constants.Space);
response.appendContent(Constants.Style);