add: public accessable reset function

Runtime/Scripts/Controls/ComboBox/DropDownList.cs

@@ -49,6 +49,9 @@ namespace UnityEngine.UI.Extensions
         private GameObject _itemTemplate;
 		private bool _initialized;
 
+		private string _defaultMainButtonCaption = null;
+		private Color _defaultNormalColor;
+
         [SerializeField]
 		private float _scrollBarWidth = 20.0f;
 		public float ScrollBarWidth
@@ -121,6 +124,9 @@ namespace UnityEngine.UI.Extensions
 				_rectTransform = GetComponent<RectTransform>();
 				_mainButton = new DropDownListButton(_rectTransform.Find("MainButton").gameObject);
 
+				_defaultMainButtonCaption = _mainButton.txt.text;
+				_defaultNormalColor = _mainButton.btn.colors.normalColor;
+
 				_overlayRT = _rectTransform.Find("Overlay").GetComponent<RectTransform>();
 				_overlayRT.gameObject.SetActive(false);
 				_scrollPanelRT = _overlayRT.Find("ScrollPanel").GetComponent<RectTransform>();
@@ -266,7 +272,21 @@ namespace UnityEngine.UI.Extensions
             RedrawPanel();
         }
 
-        public void ResetItems()
+		public void ResetDropDown()
+		{
+			if (!_initialized)
+				return;
+
+			_mainButton.txt.text = _defaultMainButtonCaption;
+			for (int i = 0; i < _itemsPanelRT.childCount; i++)
+				_panelItems[i].btnImg.color = _defaultNormalColor;
+
+			_selectedIndex = -1;
+			_initialized = false;
+			Initialize();
+		}
+
+		public void ResetItems()
 		{
 			Items.Clear();
 			RebuildPanel();