Dynamic Grouping please?

Hi, I want to have an optional group for a table.
I place this in the group expression:
=iif(Code.m_RR.GetControlParameter(Parameters!ENVIRONMENT.Value,"PA_Split_Internal_External")="true",Fields!MAKE_BUY.Value,"")
But it doesn't group at all.
If I just put =Fields!MAKE_BUY.Value it does. I thought the grouping
allowed dynamic groups? Does anyone know how to do this?
Thanks heaps,
CraigSilly me, you can do this and it works great. It helps if you group on the
correct field though!!!
"Craig" <craigm_richardson@.hotmail.com> wrote in message
news:O2i3zs4MGHA.3908@.TK2MSFTNGP10.phx.gbl...
> Hi, I want to have an optional group for a table.
> I place this in the group expression:
> =iif(Code.m_RR.GetControlParameter(Parameters!ENVIRONMENT.Value,"PA_Split_Internal_External")="true",Fields!MAKE_BUY.Value,"")
> But it doesn't group at all.
> If I just put =Fields!MAKE_BUY.Value it does. I thought the grouping
> allowed dynamic groups? Does anyone know how to do this?
> Thanks heaps,
>
> Craig
>