* UICombobox：增加FindString方法

SunnyUI/Controls/UIComboBox.cs

@@ -49,6 +49,16 @@ namespace Sunny.UI
             fullControlSelect = true;
         }
 
+        public int FindString(string s)
+        {
+            return ListBox.FindString(s);
+        }
+
+        public int FindStringExact(string s)
+        {
+            return ListBox.FindStringExact(s);
+        }
+
         private void ListBox_ItemsRemove(object sender, EventArgs e)
         {
             if (ListBox.Count == 0)

SunnyUI/Controls/UIListBox.cs

@@ -104,6 +104,16 @@ namespace Sunny.UI
             ItemsClear?.Invoke(this, e);
         }
 
+        public int FindString(string s)
+        {
+            return listbox.FindString(s);
+        }
+
+        public int FindStringExact(string s)
+        {
+            return listbox.FindStringExact(s);
+        }
+
         [Browsable(false)]
         public ListBox ListBox => listbox;