* http://stackoverflow.com/questions/5855135/css-pointer-events-property-alternative-for-ie
    * [[http://jsbin.com/uhuto/1/edit]] - Workaround for IE and Opera
    * [[http://www.vinylfox.com/forwarding-mouse-events-through-layers/]]
    * [[http://code.google.com/p/ext-ux-datadrop/source/browse/trunk/src/Override.js]] - js-code