I have one MainMenuBar with two MenuItems (Customers, Suppliers). AutoEnable=On for both MenuItems. When I Click on one MenuItem (e.g. Customers) a new window is generated based on DetailWindow. This works fine. However, the second MenuItem is disabled (e.g. Suppliers). So, it is not possible to open both Windows. When I close the open Window, both MenuItems become available.
How can I avoid that all MenuItems are disabled?