Mergable bar manager toolbars

We have an application which supports plugable controls. Each of these plugins has it's own toolbar defined i.e. like the Visual Studio solution explorer and has no knowledge of the parent application. It does not appear at first glance to be possible to use the UI studio bar manager to define toolbars in the separate controls, only context menus appear to be definable. From a useability point of view it would be nice to be able to define toolbars at the control/sub form level, which can be done by Visual Studio. Extending the idea further it would be even better to be able to define toolbars/menus at the control/sub form level that can then be merged with the parent when the control is added to the parent form as opposed to defining all the menu items at the parent level which is how the sample applications shows this.

[Modified at 03/21/2006 03:45 PM]