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less grey disabled presentation button

sergey-filipenko/vizabi,dab2000/vizabi,Gapminder/vizabi,buchslava/vizabi,jdk137/vizabi,buchslava/vizabi,dab2000/vizabi,Gapminder/vizabi,jdk137/vizabi,dab2000/vizabi,buchslava/vizabi,Gapminder/vizabi,jdk137/vizabi,vizabi/vizabi,sergey-filipenko/vizabi,sergey-filipenko/vizabi,vizabi/vizabi