Nadine,
For you not to pay Canadian income taxes, you have to qualify for the status of "non-resident".
If you don't qualify (because you choose to maintain your home there or any other reason), you are eligible to pay taxes on your income, regardless where you work.
I know it's unfair and non-sense - it only stimulates Canadians to get rid of their assets and anot to invest back in Canada, when working abroad - but that's the law!