Quote from Kassz007:
Capital losses in TFSA can only be claimed against capital gains in TFSA. You can't claim a capital loss from your TFSA account against capital gains made elsewhere.
This is true.
As far as I know, commissions from trading are considered capital loss. In a normal account they increase your capital loss, and you can use that extra loss for a deduction of other capital gains. But not in a TFSA, because any capital losses are non-deductable, in exchange for the benefit of being non-taxable as well.
The OP should enjoy the tax-free aspect.