 		}
 	}
 
-	override class func cellClass() -> AnyClass? {
+	override public class func cellClass() -> AnyClass? {
 		return ZDComboBoxCell.self
 	}
 

import Cocoa

@IBDesignable
class ZDComboBox: NSTextField {

	/// Define key for display name
	@IBInspectable var displayKey: String!

		setup()
	}

	required public init?(coder: NSCoder) {
		if let ucoder = coder as? NSKeyedUnarchiver {
			// replace class for NSTextFieldCell to use cell object for ZDComboBox
			let superCellClassName = "NSTextFieldCell"
