added visual feedback on the add button
added visual feedback on the add button

TimDix/concrete5,MichaelMaar/concrete5,TimDix/concrete5,MichaelMaar/concrete5,avdevs/concrete5,TimDix/concrete5,matt9mg/concrete5,matt9mg/concrete5,avdevs/concrete5,MichaelMaar/concrete5,avdevs/concrete5,matt9mg/concrete5