TriState checkboxes
WebTreeView provides two checkbox modes: normal and TriState. TriState checkboxes
support three visual states: checked, indeterminate, and unchecked.
Most often used to indicate that not all child nodes are in the same state, review
the Visual Studio installation wizard’s multiple-component selection to experience
a TriState checkbox. An interactive live demo is also available to more fully explore
this unique checkbox concept.