Why is IsChecked property nullable boolean in WPF CheckBox?
checkbox, wpf
Solution
It is null when you don't know if its checked or not: http://msdn.microsoft.com/en-us/library/system.windows.controls.primitives.togglebutton.ischecked.aspx
In many systems a checkbox like this is shaded instead of being checked.
Problem
Is there a case when IsChecked property on WPF CheckBox null ? I guess that will answer my question from title of question.