execute user defined command and press enter

I created the following command
command! -nargs=1 Vim :call VimGrep("<args>", g:dir_list) | copen | cc

The problem that I'm having is that it is asking me to press enter after it is executed. How can I avoid it? How can I make it open the quickfix list automatically without vim telling me to press enter. I tried putting <cr> at the end of the command, but then I get following error:

E488: Trailing characters cc^M

Any help is appreciated.

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