I hope somebody can point me in the right direction.

I have outlook 2011 installed on a macbook pro .

no problems with settings , hiding the unwanted folder and so forth to get my gmail apps account set up .

i do have a couple of aliases set up and the folders/labels are working in outlook too.

the problem i am having is when i want to reply to an email received by the alias email account  or compose an email it will only send from the primary email account and i can not find any option to select one of my alias email adresses as the sender

Any ideas anybody

Thanks