I have a simple page with an LOV and an IG. The IG where clause depends on the value of the LOV.
The LOV is a page item in the ‘Region’. The IG is a sub-region.
I have a dynamic action on the LOV item that shows the IG region when the item is not null and refreshes the region. When the item is null the region is hidden (using standard Hide/Show and Refresh Region DA options).
When the page is first opened, the LOV is empty and the IG region is hidden (due to the DAs).

When I select an item from the LOV, the IG appears but the toolbar is missing.

If I change Attributes/Heading away from ‘Page' the toolbar appears as expected:

Is this a bug or a feature?