For each member of the Items array, State indicates whether its check box is selected (cbChecked), deselected (cbUnchecked), or grayed (cbGrayed). 

State combines the information provided by the Boolean Checked property and the Boolean ItemEnabled property: 

When Checked is true, State is cbChecked. (However, when Checked is false, State may be either cbUnchecked or cbGrayed.) 

When State is cbGrayed, ItemEnabled is false. (However, ItemEnabled may also be false when State is cbUnchecked or cbChecked.) 

AllowGrayed 

Checked 

Items 

Selected 

State 

ItemEnabled