HideKeyboardFormAccessoryBar and KeyboardShrinksView show white bar instead of removing it

I use phonegap 2.6 with the two new preferences HideKeyboardFormAccessoryBar KeyboardShrinksView set to true. Instead of the AccessoryBar a white bar appears (screenshot).

This is just happening when i set both of the preferences to true. When i just set the AccessoryBar preference to true the bar disappears as planned.

Horst