Question: Create Inert Form of a Function

How can I create the inert form of the following function: dm:=z->diff(z,t)+v[c]*d_[c](z); Note d_ is the new indicial differential operator available in physics package of Maple 11. Its inert form is %d_. What I need is that when I write, dm(rho), maple does not expand it into two terms using the above function, but displays the compact form dm(rho). I want to see the expanded form, only when needed, not at every step where dm is used. So at other steps, I just want to see dm(rho), without evaluation. Thanks, Pawan Takhar
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