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http://msdn.microsoft.com/en-us/library/windows/apps/hh465493.aspx Nice set of controls, something we haven't looked at closely.
There's now lots of people experimenting with Shadow DOM (like http://blog.quickui.org/2013/06/03/quetzal-an-experimental-translation-of-quickui-component-model-to-html-custom-elements/ and http://www.polymer-project.org/), so this is no longer a pressing concern.
Ouch. OK.
LOL. I reopened the bug to alleviate sudden onset of guilt.
This bug has been useful. However, it's time to close this bug. :) Please feel free to reopen this bug if we still need this.
Thanks for considering. I really need to have the folks engineering the controls look at and provide the feedback to Shadow DOM. Since that's something I need to do, I think it's great to close this bug. No guilt necessary.