Enable MenuItem

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?

Set the MenuHandler for Suppliers in App instead of in the Window DetailWindow.

You can have done that mistake involuntarily; this happens to me sometimes, so now when I press cmd-shift-e (ctrl-shift-e), I check what I can seee in the “Add an event” window (or whatever its name is (I do not have Xojo open at this time).