With Ember's action helper, is bindAttr the only way to set CSS styles?
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With the deprecation of the Ember.Button view (w/ recent Ember trunk version) in favor of the action helper, is there a way to set the static/unchanging CSS styling of action helper's HTML element (whether that element is a button, link, etc.) without those static CSS styles being bonked/overwritten?  That is,

 - With the old Ember.Button and #view we could pass in both class (for static CSS styles) and classBinding (for dynamic CSS styles) and the static styles would be unaffected by the dynamic ones.
 - But with the new action helper, classBinding doesn't seem to work.  bindAttr does work, but any CSS classes specified for that element outside of bindAttr will be overwritten by the bindAttr class="foo" specification.
 - Thus, the only way I've found to keep static CSS styles on elements using the action helper is to specify a string property (within the relevant Ember View) specifying the CSS static styles needed.  e.g. {{bindAttr class="App.TheView.isActive App.TheView.cssStyles}}  This is inelegant/leaky.

Thanks in advance for any suggestions/help!
