Related Stackoverflow question: http://stackoverflow.com/questions/41016815/uwp-customrenderer-for-checkbox-pointer-over-checkbox-changes-style

HOW TO START THE APP:

1. Right click onthe project "CheckboxSample.UWP" -> Set as StartUp Project
2. Start Debugging (F5)

EXPECTED BEHAVIOR:

Clicking Checkboxes will enable it WITH a check inside of the Checkbox.

ACTUAL BEHAVIOR:

Clicking Checkboxes will enable it, but there is no check inside the Checkbox. Only if the items are enabled by clicking the "All" button on the bottom, all items are enabled and have a check inside the Checkbox. When moving the mouse cursor over the a checkbox, the check inside of the Checkbox disappears.