If you want to explicitly set the tab ordering for elements in your form, the following attached property is supposed to help:
<Control KeyboardNavigation.TabIndex="0" ... />
I say "supposed to help" as I haven't found it very reliable though I probably need to read more about how it is intended to be used. I only post this half baked answer because no one else mentioned this property.
Note that in Win RT, the property is just TabIndex="0"
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