lib/box.js
function bindRemoved(that, content) {
  content.on('removed', function(ev) {
    if (content === that.content) {
      delete that.content;
    }
    if (! that.content && that.header) {
      that.header.empty();
    }
  });
}
function bindRemoved(that, content) {
  content.on('removed', function(ev) {
    if (content === that.content) {
      delete that.content;
    }
    if (! that.content && that.header) {
      that.header.empty();
    }
  });
}
Private {{{1