Unity Script Reference:

static function EnumPopup(position: Rect, selected: Enum, style: GUIStyle = EditorStyles.popup): Enum;

static function EnumPopup(position: Rect, label: string, selected: Enum, style: GUIStyle = EditorStyles.popup): Enum;

static function EnumPopup(position: Rect, label: GUIContent, selected: Enum, style: GUIStyle = EditorStyles.popup): Enum;

Parameters

position	Rectangle on the screen to use for the field.
label	Optional label in front of the field.
selected	The enum option the field shows.
style	Optional GUIStyle.

Returns
Enum The enum option that has been selected by the user.

Description

Make an enum popup selection field.

Takes the currently selected enum value as a parameter and returns the enum value selected by the user.

Enum Popup in an Editor Window.

	// Shows info of a GameObject depending on the selected option
	
	enum OPTIONS {
		Position = 0,
		Rotation = 1,
		Scale = 2,
	}
	
	class EditorGUIEnumPopup extends EditorWindow {
	
		var display : OPTIONS = OPTIONS.Position;
	
		@MenuItem("Examples/Editor GUI Enum Popup usage")
		static function Init() {
			var window = GetWindow(EditorGUIEnumPopup);
			window.position = Rect(0, 0, 220, 80);
			window.Show();
		}
		
		function OnGUI() {
			var selectedObj : Transform = Selection.activeTransform;
			display = EditorGUI.EnumPopup(
				Rect(3,3,position.width - 6, 15),
				"Show:",
				display);
				EditorGUI.LabelField(Rect(0, 20, position.width,15),
					"Name:",
					selectedObj ? selectedObj.name : "Select an Object");
			if(selectedObj) {
				switch(display) {
					case OPTIONS.Position:
						EditorGUI.LabelField(Rect(0, 40, position.width,15),
							"Position:",
							selectedObj.position.ToString());
						break;
						
					case OPTIONS.Rotation:
						EditorGUI.LabelField(Rect(0, 40, position.width,15),
							"Rotation:",
							selectedObj.rotation.ToString());
						break;
					
					case OPTIONS.Scale:
						EditorGUI.LabelField(Rect(0, 40, position.width,15),
							"Scale:",
							selectedObj.localScale.ToString());
						break;
					
					default:
						Debug.LogError("Unrecognized Option");
						break;
				}
			}
			if(GUI.Button(Rect(3,position.height - 25, position.width - 6, 24),"Close"))
				this.Close();
		}
	}