fix bug with visible screens. Screens will now get visible by setting the visible attribute. Before that fix a screen only can get visible by calling the ShowView function of the BrailleIOMediator
fix bug with visible screens. Screens will now get visible by setting the visible attribute. Before that fix a screen only can get visible by calling the ShowView function of the BrailleIOMediator

TUD-INF-IAI-MCI/BrailleIO,TUD-INF-IAI-MCI/BrailleIO,TUD-INF-IAI-MCI/BrailleIO,TUD-INF-IAI-MCI/BrailleIO