private void ShowAddressOrLatLonUI(SerializedProperty property)
        {
            //EditorGUILayout.BeginVertical();
            var coordinateProperties = property.FindPropertyRelative("coordinates");

            for (int i = 0; i < coordinateProperties.arraySize; i++)
            {
                EditorGUILayout.BeginHorizontal();
                //get the element to draw
                var coordinate = coordinateProperties.GetArrayElementAtIndex(i);

                //label for each location.
                var coordinateLabel = String.Format("Location {0}", i);

                // draw coordinate string.
                EditorGUI.BeginChangeCheck();
                coordinate.stringValue = EditorGUILayout.TextField(coordinateLabel, coordinate.stringValue);

                if (EditorGUI.EndChangeCheck())
                {
                    EditorHelper.CheckForModifiedProperty(property, true);
                }
                // draw search button.
                if (GUILayout.Button(new GUIContent(searchButtonContent), (GUIStyle)"minibuttonleft", GUILayout.MaxWidth(100)))
                {
                    object propertyObject = EditorHelper.GetTargetObjectOfProperty(property);
                    GeocodeAttributeSearchWindow.Open(coordinate, propertyObject);
                }

                //include a remove button in the row
                if (GUILayout.Button(new GUIContent(" X "), (GUIStyle)"minibuttonright", GUILayout.MaxWidth(30)))
                {
                    coordinateProperties.DeleteArrayElementAtIndex(i);
                    EditorHelper.CheckForModifiedProperty(property);
                }
                EditorGUILayout.EndHorizontal();
            }

            EditorGUILayout.BeginHorizontal();
            GUILayout.Space(EditorGUIUtility.labelWidth - 3);

            if (GUILayout.Button(new GUIContent("Add Location"), (GUIStyle)"minibutton"))
            {
                coordinateProperties.arraySize++;
                var newElement = coordinateProperties.GetArrayElementAtIndex(coordinateProperties.arraySize - 1);
                newElement.stringValue = "";
                EditorHelper.CheckForModifiedProperty(property);
            }
            EditorGUILayout.EndHorizontal();
        }
        public override void OnGUI(Rect position, SerializedProperty property, GUIContent label)
        {
            float buttonWidth = EditorGUIUtility.singleLineHeight * 4;

            Rect fieldRect  = new Rect(position.x, position.y, position.width - buttonWidth, EditorGUIUtility.singleLineHeight);
            Rect buttonRect = new Rect(position.x + position.width - buttonWidth, position.y, buttonWidth, EditorGUIUtility.singleLineHeight);

            EditorGUI.PropertyField(fieldRect, property);

            if (GUI.Button(buttonRect, searchButtonContent))
            {
                GeocodeAttributeSearchWindow.Open(property);
            }
        }