Add hasTouchHitTesterOfType() check

src/org/gestouch/core/Gestouch.as

@@ -65,6 +65,19 @@ package org.gestouch.core
 			
 			_displayListAdaptersMap[targetClass] = adapter;
 		}
+
+
+		/**
+		 * Checks whether touch hit-tester of specified type is registered.
+		 * NB! Checks against type (class) without considering subclasses.
+		 *
+		 * @param type The touch hit-tester class
+		 * @return Boolean
+		 */
+		public static function hasTouchHitTesterOfType(type:Class):Boolean
+		{
+			return touchesManager.gestouch_internal::hasTouchHitTesterOfType(type);
+		}
 		
 		
 		public static function addTouchHitTester(hitTester:ITouchHitTester, priority:int = 0):void

src/org/gestouch/core/GesturesManager.as

@@ -52,7 +52,10 @@ package org.gestouch.core
 			{
 				Gestouch.inputAdapter = new NativeInputAdapter(stage);
 			}
-			Gestouch.addTouchHitTester(new NativeTouchHitTester(stage));
+			if (!Gestouch.hasTouchHitTesterOfType(NativeTouchHitTester))
+			{
+				Gestouch.addTouchHitTester(new NativeTouchHitTester(stage));
+			}
 		}
 		
 		

src/org/gestouch/core/TouchesManager.as

@@ -69,6 +69,20 @@ package org.gestouch.core
 			// Sort hit testers using their priorities
 			_hitTesters.sort(hitTestersSorter);
 		}
+
+
+		gestouch_internal function hasTouchHitTesterOfType(type:Class):Boolean
+		{
+			for each (var hitTester:ITouchHitTester in _hitTesters)
+			{
+				if ((hitTester as Object).constructor == type)
+				{
+					return true;
+				}
+			}
+
+			return false;
+		}
 		
 		
 		gestouch_internal function removeTouchHitTester(touchHitTester:ITouchHitTester):void