How to get session->flashdata() working in HMVC module?

[eluser]helloworldly[/eluser]
My app = CI + Modular Extensions - HMVC.

+ 'Session' library is autoloaded.
+ Am able to store and retrieve session flash data from application/somecontroller
+ BUT I am unable to store and retrieve session flash data from Modular Extension controller that is loaded into application/someview via ajax.

Adding this to module's controller does not seem to store the data:

Code:

$this->session->set_flashdata( 'message', 'ERROR: some message here.');

nothing is displayed...

Code:

echo $this->session->flashdata('message');

... unless I set flashdata within the parent application/somecontroller.

Thoughts how to make this work via the module so that I can provide error / notice messaging within a module? Thanks!