diff --git a/src/org/ntlab/traceDebugger/CallStackModel.java b/src/org/ntlab/traceDebugger/CallStackModel.java
index 5fbc854..ff24a40 100644
--- a/src/org/ntlab/traceDebugger/CallStackModel.java
+++ b/src/org/ntlab/traceDebugger/CallStackModel.java
@@ -1,66 +1,78 @@
-package org.ntlab.traceDebugger;
-
-import org.ntlab.traceAnalysisPlatform.tracer.trace.MethodExecution;
-import org.ntlab.traceAnalysisPlatform.tracer.trace.Trace;
-import org.ntlab.traceAnalysisPlatform.tracer.trace.TracePoint;
-
-public class CallStackModel {
-	private TracePoint tracePoint;
-	private boolean isHighlighting;
-	
-	public CallStackModel(TracePoint tracePoint) {
-		this.tracePoint = tracePoint;
-	}
-	
-	public TracePoint getTracePoint() {
-		return tracePoint;
-	}
-	
-	public MethodExecution getMethodExecution() {
-		return tracePoint.getMethodExecution();
-	}
-
-	public int getCallLineNo() {
-		return tracePoint.getStatement().getLineNo();
-	}
-	
-	public String getSignature() {
-		return tracePoint.getMethodExecution().getSignature();
-	}
-	
-	public String getCallStackSignature() {
-		String signature = "";		
-		signature = getSignature();
-		MethodExecution methodExecution = tracePoint.getMethodExecution();
-		String objectType = methodExecution.getThisClassName();
-		objectType = objectType.substring(objectType.lastIndexOf(".") + 1);
-		boolean isConstructor = methodExecution.isConstructor();
-		String declaringType = Trace.getDeclaringType(signature, isConstructor);
-		declaringType = declaringType.substring(declaringType.lastIndexOf(".") + 1);
-		String methodName = Trace.getMethodName(signature);
-		String args = "(";
-		String delimiter = "";
-		String[] argArray = signature.split("\\(")[1].split(",");
-		for (String arg : argArray) {
-			args += (delimiter + arg.substring(arg.lastIndexOf(".") + 1));
-			delimiter = ", ";
-		}
-		
-		StringBuilder sb = new StringBuilder();
-		sb.append(objectType);
-		if (!declaringType.equals(objectType)) {
-			sb.append("(" + declaringType + ")");
-		}
-		sb.append("." + methodName + args);
-		signature = sb.toString();
-		return signature;
-	}
-
-	public boolean isHighlighting() {
-		return isHighlighting;
-	}
-	
-	public void setHighlighting(boolean isHighlighting) {
-		this.isHighlighting = isHighlighting;
-	}	
-}
+package org.ntlab.traceDebugger;
+
+import org.ntlab.traceAnalysisPlatform.tracer.trace.MethodExecution;
+import org.ntlab.traceAnalysisPlatform.tracer.trace.Trace;
+import org.ntlab.traceAnalysisPlatform.tracer.trace.TracePoint;
+
+public class CallStackModel {
+	private TracePoint tracePoint;
+	private boolean isHighlighting;
+	
+	public CallStackModel(TracePoint tracePoint) {
+		this.tracePoint = tracePoint;
+	}
+	
+	public TracePoint getTracePoint() {
+		return tracePoint;
+	}
+	
+	public MethodExecution getMethodExecution() {
+		return tracePoint.getMethodExecution();
+	}
+
+	public int getCallLineNo() {
+		return tracePoint.getStatement().getLineNo();
+	}
+	
+	public String getSignature() {
+		return tracePoint.getMethodExecution().getSignature();
+	}
+
+	public String getCallStackSignature() {
+		String signature = "";		
+		signature = getSignature();
+		MethodExecution methodExecution = tracePoint.getMethodExecution();
+		String objectType = methodExecution.getThisClassName();
+		objectType = objectType.substring(objectType.lastIndexOf(".") + 1);
+		boolean isConstructor = methodExecution.isConstructor();
+		String declaringType = Trace.getDeclaringType(signature, isConstructor);
+
+		declaringType = removePackageNameFromSignature(declaringType);
+		String methodName = Trace.getMethodName(signature);
+		String args = "(";
+		String delimiter = "";
+		String[] argArray = signature.split("\\(")[1].split(",");
+		for (String arg : argArray) {
+			args += (delimiter + removePackageNameFromSignature(arg));
+			delimiter = ", ";
+		}
+		
+		StringBuilder sb = new StringBuilder();
+		sb.append(objectType);
+		if (!declaringType.equals(objectType)) {
+			sb.append("(" + declaringType + ")");
+		}
+		sb.append("." + methodName + args);
+		signature = sb.toString();
+		return signature;
+	}
+	
+	private String removePackageNameFromSignature(String signature) {
+		String subSignature = signature;
+		while (true) {
+			if (!(subSignature.contains("."))) break;
+			subSignature = subSignature.substring(subSignature.indexOf(".") + 1);
+			if (subSignature.isEmpty()) break;
+			if (Character.isUpperCase(subSignature.charAt(0))) break;
+		}
+		return subSignature;
+	}
+	
+	public boolean isHighlighting() {
+		return isHighlighting;
+	}
+	
+	public void setHighlighting(boolean isHighlighting) {
+		this.isHighlighting = isHighlighting;
+	}	
+}
diff --git a/src/org/ntlab/traceDebugger/Variable.java b/src/org/ntlab/traceDebugger/Variable.java
index 0156d8d..125ff5f 100644
--- a/src/org/ntlab/traceDebugger/Variable.java
+++ b/src/org/ntlab/traceDebugger/Variable.java
@@ -132,6 +132,10 @@
 	public TracePoint getBeforeTracePoint() {
 		return before;
 	}
+
+	public void setBeforeTracePoint(TracePoint before) {
+		this.before = before;
+	}
 	
 	public Variable getParent() {
 		return parent;
diff --git a/src/org/ntlab/traceDebugger/Variables.java b/src/org/ntlab/traceDebugger/Variables.java
index 915b369..b0e5bbb 100644
--- a/src/org/ntlab/traceDebugger/Variables.java
+++ b/src/org/ntlab/traceDebugger/Variables.java
@@ -155,19 +155,20 @@
 	}
 		
 	public void updateForDifferential(TracePoint from, TracePoint to, boolean isReturned) {
-		updateForDifferential();
+		updateForDifferential(to);
 		resetSpecialValues();
 		createSpecialVariables(from, to, isReturned);
 	}
 	
-	private void updateForDifferential() {
+	private void updateForDifferential(TracePoint before) {
 		for (Variable variable : roots) {
-			updateForDifferential(variable, new HashSet<String>());
+			updateForDifferential(variable, new HashSet<String>(), before);
 		}
 		containerIdToDifferentialUpdateTracePoints.clear();
 	}
 
-	private void updateForDifferential(Variable variable, Set<String> hasCheckedObjectIdSet) {
+	private void updateForDifferential(Variable variable, Set<String> hasCheckedObjectIdSet, TracePoint before) {
+		variable.setBeforeTracePoint(before);
 		Set<String> containerIdList = containerIdToDifferentialUpdateTracePoints.keySet();
 		String containerId = variable.getContainerId();
 		if (containerIdList.contains(containerId)) {
@@ -191,7 +192,7 @@
 		hasCheckedObjectIdSetOnNext.add(variable.getContainerId());
 		for (Variable child : variable.getChildren()) {
 			if (hasCheckedObjectIdSetOnNext.contains(child.getContainerId())) continue;
-			updateForDifferential(child, hasCheckedObjectIdSetOnNext);
+			updateForDifferential(child, hasCheckedObjectIdSetOnNext, before);
 		}
 	}