UI Shell with BTF from ADF library issue

I've created an application component (Bounded Task Flow) wrapped in an ADF library for reuse. I am able to import this into "normal" ADF applications and place it on a page as a Region. Works as expected and looks good.
I'm attempting to add this to a page based on the UIShell template and am getting an exception on startup:
java.lang.IllegalStateException: The expression "#{bindings.emmain1.regionModel}" (that was specified for the RegionModel "value" attribute of the region component with id "r1") evaluated to null.
This is typically due to an error in the configuration of the objects referenced by this expression.
If it helps, the expression "#{bindings.emmain1}" evaluates to "null".
If it helps, the expression "#{bindings}" evaluates to "oracle_demo_uist3_view_view1PageDef". Now using an empty RegionModel instead.
     at oracle.adf.view.rich.component.fragment.UIXRegion.getRegionModel(UIXRegion.java:439)
     at oracle.adfinternal.view.faces.taglib.region.RegionTag.doStartTag(RegionTag.java:109)
     at oracle.jsp.runtime.tree.OracleJspBodyTagNode.executeHandler(OracleJspBodyTagNode.java:50)
<lots more>
The designer shows the UI as expected so I'm assuming something is not configured correctly for runtime (duh!), but I cannot figure out what it is.
I've tried referencing the task flow directly from the navigation bean and wrapping the external BTF in a local BTF and navigating to that. Neither works.
Any help would be greatly appreciated.
Thanks,
Gene

Change the launcher bean to call the imported ADF Library bounded task flow to open it as an activity within one of the dynamic tabs. This is done by referencing the correct task-flow.xml file.

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Further to my other post, we're having lots of fun with the UI Shell, it's making mockups very easy.
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And we're back again.... what's a couple months between friends?
So it turns out after testing our app (d@mn, so close) that we've hit a bug with this approach.
Our current app allows one BTF to be open in the UI Shell at any one time. Our menu options automatically open one BTF at a time by the user (max one open), and close the previous BTF. However we have some "special" BTFs that require the user to explicitly close the BTF, which in turn makes use of the regionNavigationListener solution I described earlier in this post.
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doh!
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What I haven't been able to work out is how the bindings get turned on/off dynamically for each BTF being invoked. Presumably for some reason on step 3, the BTF's bindings aren't being correctly removed from r2 even though we called TabContext.removeTab().
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