diff --git a/src/interaction/interactiveTarget.js b/src/interaction/interactiveTarget.js
index 2fa0bf7..9a0f4fb 100644
--- a/src/interaction/interactiveTarget.js
+++ b/src/interaction/interactiveTarget.js
@@ -3,10 +3,13 @@
 var tempPoint = new core.math.Point();
 
 core.DisplayObject.prototype.interactive = false;
-core.DisplayObject.prototype.buttomMode = false;
+core.DisplayObject.prototype.buttonMode = false;
 core.DisplayObject.prototype.interactiveChildren = true;
 core.DisplayObject.prototype.defaultCursor = 'pointer';
 
+// some internal checks..
+core.DisplayObject.prototype._over = false;
+core.DisplayObject.prototype._touchDown = false;
 
 core.Sprite.prototype.hitTest = function( point )
 {