Indicates which items act as headers.
property Header [Index: Integer]: Boolean;
__property Boolean Header[int Index];
Set Header to true to specify that an item in the check listbox acts as a header rather than a selectable item. By setting Header to true for various items in the list, you can divide the check listbox into multiple sections, where each header labels the beginning of a section.
When Header is true for an item, the list box does not display a check box next to the item, but rather, it displays only the item's text. This item is drawn with a background color of HeaderBackgroundColor and a font color of HeaderColor, which can be used to make it visually distinct from the checkable items in the list box.
Index is the index of the item.
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