That's a great question, because therein lies another problem. The fact is that we have no mechanism within Canadian domestic law to enforce the provisions of the CRC. It is one of those unfortunate disconnects between what we've stated as our international obligations and what we go about doing.
In terms of the actual legal issue that compels Canada to comply, I would in fact point you to the findings of the Senate human rights committee that looked at this very issue around the implementation of the convention and made a number of interesting recommendations for the government to consider about improving its ability to comply.