Anything using FocusManager.GetFocusedElement needs to be updated for XamlRoot in 7.0

[michael-hawker]

Describe the bug

We need to provide the XamlRoot to FocusManager for this call to work properly. Any control in the toolkit using this (TokenizingTextBox, Menu, etc...) currently won't work in Xaml Islands properly.

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[Kyaa-dost]

#3352 already fixed this issue.