private void _MicOffIcon_Tapped(object sender, EventArgs e)
 {
     _MicOffIcon.Opacity = Utilities.OpacityToggler(_MicOffIcon.Opacity, DefOpacity);
 }
 private void _VideoCamIcon_Tapped(object sender, EventArgs e)
 {
     _VideoCamIcon.Opacity = Utilities.OpacityToggler(_VideoCamIcon.Opacity, DefOpacity);
 }