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Gets the image list that is used to indicate the state of the C1CheckList items.
[TypeConverter(typeof(ImageListConverter))]
public ImageList CheckImageList { get; }
When the CheckImageList property is set, each C1CheckListItem that is contained in the C1CheckList displays the first and second images from the CheckImageList to indicate an unchecked or checked state, respectively. Additionally the C1CheckList can displays the twelve state of checkbox if the CheckImageList property contains twelve images with keys from CheckBoxState enum.