As you discovered, when adding a menu you must select the active menu bar - either the graph, worksheet, layout page, or matrix window menu bar. Likewise when you create your own toolbar you must specify the window(s) that you want your toolbar to be available for.

One possible way to get around this is to create a system window which has your buttons on it. For example, create a new worksheet. Delete the columns. Open the Worksheet Display Control dialog box by selecting Format:Worksheet. Here you can change the background color from white to gray. In the Script Window, run the following script:

page.syswin=1;

This window will now remain open between Origin projects.

If you have further questions, please email me.