Features of eXComboBox include:

Compatible with the Data Execution Prevention (DEP)
Simple, DropDown and DropDownList styles.
Drop down window acts like a simple list box, multi-columns list view, standard tree or multi-columns tree.
WYSWYG Template/Layout Editor support.
Skinnable Interface support ( ability to apply a skin to any background part )
Print and Print Preview support.
'start with' and 'contains ' incremental searching support
FilterBar Support. Ability to filter items with an easy-to-use interface.
Ability to filter items using patterns that include wild card characters like *, ? or #, items between two dates or numbers, with an easy-to-use interface.
Ability to filter items using AND, OR, or NOT operators between columns.
Conditional Format supports numbers, strings and dates.
Computed Fields support.
Owner Draw Support.
Data Bounding and Unbound Mode support
Multiple edit controls.
Multiple levels header support.
Sorting by Single Or Multiple Columns.
Locked columns support.
"Merge Cells" support
Locked/Fixed rows/items support.
Ability to specify not selectable items
Prompt support
Any cell supports Built-in HTML format.
Ability to assign HTML multi-lines tooltips to cells.
Ability to show the control's elements from right-to-left for Hebrew, Arabic and other RTL languages
Ability to assign multiple icons to a cell.
Ability to resize the drop-down window, using the size grip.
Ability to change the look for expanding buttons or hierarchy lines.
Ability to handle divider items, or merging cells
Unlimited color and font options for any item or cell
Items with different height, multi-line items
Images, check boxes, partial check, radio buttons support.
Ability to load the control's list of icons using BASE64 encoded strings.
Mouse wheel support
and more