treecombobox StateImages property
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Applies to
tcTreeComboBox component.  

property StateImages: TImageList;  

The StateImages property determines which image list to use for state images.  
Use StateImages to provide a set of bitmaps that reflect the state of tree view nodes. The state image appears as an additional image to the left of the item's icon.  

See also
Images, TreeOptions and TreeView properties.