diff --git a/Assets/Demo/scripts/FPSHUD.cs b/Assets/Demo/scripts/FPSHUD.cs
index 030cc50..7cdee9f 100644
--- a/Assets/Demo/scripts/FPSHUD.cs
+++ b/Assets/Demo/scripts/FPSHUD.cs
@@ -33,7 +33,7 @@ void Awake()
 
 	void Start()
 	{
-	    if( !guiText )
+	    if( !GetComponent<GUIText>() )
 	    {
 	        Debug.Log("UtilityFramesPerSecond needs a GUIText component!");
 	        enabled = false;
@@ -55,18 +55,18 @@ void Update()
 	        // display two fractional digits (f2 format)
 		    float fps = accum/frames;
 		    string format = System.String.Format("{0:F2} FPS",fps);
-		    guiText.text = format;
+		    GetComponent<GUIText>().text = format;
 
 		    if( fps < 20 )
 			{
-		        guiText.material.color = Color.yellow;
+		        GetComponent<GUIText>().material.color = Color.yellow;
 			}
 		    else
 			{
 		        if( fps < 10 )
-		            guiText.material.color = Color.red;
+		            GetComponent<GUIText>().material.color = Color.red;
 		        else
-		            guiText.material.color = Color.green;
+		            GetComponent<GUIText>().material.color = Color.green;
 	
 		        timeleft = updateInterval;
 		        accum = 0.0F;
diff --git a/Assets/Plugins/GoKit/Go.cs b/Assets/Plugins/GoKit/Go.cs
index 94fadb6..0818022 100644
--- a/Assets/Plugins/GoKit/Go.cs
+++ b/Assets/Plugins/GoKit/Go.cs
@@ -363,6 +363,39 @@ public static bool removeTween( AbstractGoTween tween )
 		return false;
 	}
 
+	/// <summary>
+	/// removes the Tween with specific tag
+	/// </summary>
+	public static void removeTweenWithTag( string tag )
+	{
+		List<AbstractGoTween> tweenList = tweensWithTag( tag );
+		if( tweenList != null )
+		{
+			foreach( var tween in tweenList )
+			{
+				removeTween( tween );
+			}
+		}
+	}	
+	
+	/// <summary>
+	/// returns a list of all Tweens, TweenChains and TweenFlows with the given tag
+	/// </summary>
+	public static List<AbstractGoTween> tweensWithTag( string tag )
+	{
+		List<AbstractGoTween> list = null;
+		foreach( var tween in _tweens )
+		{
+			if( tween.tag == tag )
+			{
+				if( list == null )
+					list = new List<AbstractGoTween>();
+				list.Add( tween );
+			}
+		}
+		
+		return list;
+	}
 
 	/// <summary>
 	/// returns a list of all Tweens, TweenChains and TweenFlows with the given id
diff --git a/Assets/Plugins/GoKit/GoProxyProp.cs b/Assets/Plugins/GoKit/GoProxyProp.cs
new file mode 100644
index 0000000..32decf4
--- /dev/null
+++ b/Assets/Plugins/GoKit/GoProxyProp.cs
@@ -0,0 +1,14 @@
+using UnityEngine;
+using System.Collections;
+
+public class GoProxyProp<T>  
+{
+
+	public T value { get; set; }
+	
+	public GoProxyProp( T startValue )
+	{
+		value = startValue;
+	}                                                   
+    
+}
diff --git a/Assets/Plugins/GoKit/base/AbstractGoTween.cs b/Assets/Plugins/GoKit/base/AbstractGoTween.cs
index d3ad6f3..586a072 100644
--- a/Assets/Plugins/GoKit/base/AbstractGoTween.cs
+++ b/Assets/Plugins/GoKit/base/AbstractGoTween.cs
@@ -10,7 +10,8 @@
 /// </summary>
 public abstract class AbstractGoTween
 {
-	public int id = 0; // optional id used for identifying this tween
+	public int id { get; set; } // optional id used for identifying this tween
+	public string tag { get; set; } // optional tag used for identifying this tween	
 	public GoTweenState state { get; protected set; } // current state of the tween
 	public float duration { get; protected set; } // duration for a single loop
 	public float totalDuration { get; protected set; } // duration for all loops of this tween
diff --git a/Assets/Plugins/GoKit/properties/abstracts/AbstractMaterialColorTweenProperty.cs b/Assets/Plugins/GoKit/properties/abstracts/AbstractMaterialColorTweenProperty.cs
index 5e8ff26..b11b778 100644
--- a/Assets/Plugins/GoKit/properties/abstracts/AbstractMaterialColorTweenProperty.cs
+++ b/Assets/Plugins/GoKit/properties/abstracts/AbstractMaterialColorTweenProperty.cs
@@ -33,9 +33,9 @@ public override void init( GoTween owner )
 		if( owner.target is Material )
 			_target = (Material)owner.target;
 		else if( owner.target is GameObject )
-			_target = ((GameObject)owner.target).renderer.material;
+			_target = ((GameObject)owner.target).GetComponent<Renderer>().material;
 		else if( owner.target is Transform )
-			_target = ((Transform)owner.target).renderer.material;
+			_target = ((Transform)owner.target).GetComponent<Renderer>().material;
 		else if( owner.target is Renderer )
 			_target = ((Renderer)owner.target).material;
 		
diff --git a/Assets/Plugins/GoKit/properties/abstracts/AbstractMaterialFloatTweenProperty.cs b/Assets/Plugins/GoKit/properties/abstracts/AbstractMaterialFloatTweenProperty.cs
index 87ef6a1..989486a 100644
--- a/Assets/Plugins/GoKit/properties/abstracts/AbstractMaterialFloatTweenProperty.cs
+++ b/Assets/Plugins/GoKit/properties/abstracts/AbstractMaterialFloatTweenProperty.cs
@@ -33,9 +33,9 @@ public override void init( GoTween owner )
 		if( owner.target is Material )
 			_target = (Material)owner.target;
 		else if( owner.target is GameObject )
-			_target = ((GameObject)owner.target).renderer.material;
+			_target = ((GameObject)owner.target).GetComponent<Renderer>().material;
 		else if( owner.target is Transform )
-			_target = ((Transform)owner.target).renderer.material;
+			_target = ((Transform)owner.target).GetComponent<Renderer>().material;
 		else if( owner.target is Renderer )
 			_target = ((Renderer)owner.target).material;
 		
diff --git a/Assets/Plugins/GoKit/properties/abstracts/AbstractMaterialVectorTweenProperty.cs b/Assets/Plugins/GoKit/properties/abstracts/AbstractMaterialVectorTweenProperty.cs
index a82710c..0cc9308 100644
--- a/Assets/Plugins/GoKit/properties/abstracts/AbstractMaterialVectorTweenProperty.cs
+++ b/Assets/Plugins/GoKit/properties/abstracts/AbstractMaterialVectorTweenProperty.cs
@@ -33,9 +33,9 @@ public override void init( GoTween owner )
 		if( owner.target is Material )
 			_target = (Material)owner.target;
 		else if( owner.target is GameObject )
-			_target = ((GameObject)owner.target).renderer.material;
+			_target = ((GameObject)owner.target).GetComponent<Renderer>().material;
 		else if( owner.target is Transform )
-			_target = ((Transform)owner.target).renderer.material;
+			_target = ((Transform)owner.target).GetComponent<Renderer>().material;
 		else if( owner.target is Renderer )
 			_target = ((Renderer)owner.target).material;
 		
diff --git a/ProjectSettings/GraphicsSettings.asset b/ProjectSettings/GraphicsSettings.asset
index 91be959..d75e792 100644
Binary files a/ProjectSettings/GraphicsSettings.asset and b/ProjectSettings/GraphicsSettings.asset differ
diff --git a/ProjectSettings/NavMeshAreas.asset b/ProjectSettings/NavMeshAreas.asset
new file mode 100644
index 0000000..53da2ee
Binary files /dev/null and b/ProjectSettings/NavMeshAreas.asset differ
diff --git a/ProjectSettings/ProjectSettings.asset b/ProjectSettings/ProjectSettings.asset
index cbb17ef..307c0ca 100644
Binary files a/ProjectSettings/ProjectSettings.asset and b/ProjectSettings/ProjectSettings.asset differ