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In TreeNodeBase there are two properties:
public virtual ThreeStateBool Checked
and
public virtual ThreeStateBool Expandable
with very strange Enum ThreeStateBool,
may be better to use is Nullable<bool> (bool?)?
there are same three states - true/false/null
Hello!
Maybe you are right... But this way has been chosen. Perhaps because of the "undefined" value is closer to JavaScript's undefined.
At least there is one advantage. It would be easier to make refactoring if one more bool state appears:)