diff --git a/querydsl-core/src/main/java/com/mysema/query/types/custom/CBoolean.java b/querydsl-core/src/main/java/com/mysema/query/types/custom/CBoolean.java
index ad75cc1c2..e9ccc2a64 100644
--- a/querydsl-core/src/main/java/com/mysema/query/types/custom/CBoolean.java
+++ b/querydsl-core/src/main/java/com/mysema/query/types/custom/CBoolean.java
@@ -25,13 +25,10 @@ public class CBoolean extends EBoolean implements Custom<Boolean> {
         return new CBoolean(args, template);
     }
     
-    private final List<Expr<?>> args;
-    
-    private final Template template;
+    private final Custom<Boolean> customMixin;
     
     public CBoolean(List<Expr<?>> args, Template template){
-        this.args = args;
-        this.template = template;
+        customMixin = new CustomMixin<Boolean>(args, template);
     }
     
     @Override
@@ -41,16 +38,16 @@ public class CBoolean extends EBoolean implements Custom<Boolean> {
     
     @Override
     public Expr<?> getArg(int index) {
-        return getArgs().get(index);
+        return customMixin.getArg(index);
     }
 
     @Override
     public List<Expr<?>> getArgs() {
-        return args;
+        return customMixin.getArgs();
     }
 
     @Override
     public Template getTemplate() {
-        return template;
+        return customMixin.getTemplate();
     }
 }
\ No newline at end of file
diff --git a/querydsl-core/src/main/java/com/mysema/query/types/custom/CComparable.java b/querydsl-core/src/main/java/com/mysema/query/types/custom/CComparable.java
index cfb6e4276..bf5411f35 100644
--- a/querydsl-core/src/main/java/com/mysema/query/types/custom/CComparable.java
+++ b/querydsl-core/src/main/java/com/mysema/query/types/custom/CComparable.java
@@ -26,14 +26,11 @@ public class CComparable<T extends Comparable<?>> extends EComparable<T> impleme
         return new CComparable<T>(type, args, template);
     }
     
-    private final List<Expr<?>> args;
-    
-    private final Template template;
+    private final Custom<T> customMixin;
 
     public CComparable(Class<T> type, List<Expr<?>> args, Template template) {
         super(type);
-        this.args = args;
-        this.template = template;
+        customMixin = new CustomMixin<T>(args, template);
     }
     
     @Override
@@ -43,16 +40,17 @@ public class CComparable<T extends Comparable<?>> extends EComparable<T> impleme
     
     @Override
     public Expr<?> getArg(int index) {
-        return getArgs().get(index);
+        return customMixin.getArg(index);
     }
 
     @Override
     public List<Expr<?>> getArgs() {
-        return args;
+        return customMixin.getArgs();
     }
-    
+
     @Override
     public Template getTemplate() {
-        return template;
+        return customMixin.getTemplate();
     }
+    
 }
\ No newline at end of file
diff --git a/querydsl-core/src/main/java/com/mysema/query/types/custom/CNumber.java b/querydsl-core/src/main/java/com/mysema/query/types/custom/CNumber.java
index 5fe986bac..889eb6136 100644
--- a/querydsl-core/src/main/java/com/mysema/query/types/custom/CNumber.java
+++ b/querydsl-core/src/main/java/com/mysema/query/types/custom/CNumber.java
@@ -26,14 +26,11 @@ public class CNumber<T extends Number & Comparable<?>> extends ENumber<T> implem
         return new CNumber<T>(type, args, template);
     }
     
-    private final List<Expr<?>> args;
-    
-    private final Template template;
+    private final Custom<T> customMixin;
     
     public CNumber(Class<T> type, List<Expr<?>> args, Template template) {
         super(type);
-        this.args = args;
-        this.template = template;
+        customMixin = new CustomMixin<T>(args, template);
     }
 
     @Override
@@ -43,16 +40,16 @@ public class CNumber<T extends Number & Comparable<?>> extends ENumber<T> implem
     
     @Override
     public Expr<?> getArg(int index) {
-        return getArgs().get(index);
+        return customMixin.getArg(index);
     }
 
     @Override
     public List<Expr<?>> getArgs() {
-        return args;
+        return customMixin.getArgs();
     }
-    
+
     @Override
     public Template getTemplate() {
-        return template;
+        return customMixin.getTemplate();
     }
 }
\ No newline at end of file
diff --git a/querydsl-core/src/main/java/com/mysema/query/types/custom/CSimple.java b/querydsl-core/src/main/java/com/mysema/query/types/custom/CSimple.java
index be80f7437..cdd512b8c 100644
--- a/querydsl-core/src/main/java/com/mysema/query/types/custom/CSimple.java
+++ b/querydsl-core/src/main/java/com/mysema/query/types/custom/CSimple.java
@@ -25,14 +25,11 @@ public class CSimple<T> extends Expr<T> implements Custom<T> {
         return new CSimple<T>(type, args, template);
     }
     
-    private final List<Expr<?>> args;
-    
-    private final Template template;
+    private final Custom<T> customMixin;
     
     public CSimple(Class<? extends T> type, List<Expr<?>> args, Template template) {
         super(type);
-        this.args = args;
-        this.template = template;
+        customMixin = new CustomMixin<T>(args, template);
     }
 
     @Override
@@ -42,16 +39,16 @@ public class CSimple<T> extends Expr<T> implements Custom<T> {
     
     @Override
     public Expr<?> getArg(int index) {
-        return getArgs().get(index);
+        return customMixin.getArg(index);
     }
 
     @Override
     public List<Expr<?>> getArgs() {
-        return args;
+        return customMixin.getArgs();
     }
-    
+
     @Override
     public Template getTemplate() {
-        return template;
+        return customMixin.getTemplate();
     }
 }
\ No newline at end of file
diff --git a/querydsl-core/src/main/java/com/mysema/query/types/custom/CString.java b/querydsl-core/src/main/java/com/mysema/query/types/custom/CString.java
index f2fd20dd2..9b2d8441c 100644
--- a/querydsl-core/src/main/java/com/mysema/query/types/custom/CString.java
+++ b/querydsl-core/src/main/java/com/mysema/query/types/custom/CString.java
@@ -25,13 +25,10 @@ public class CString extends EString implements Custom<String> {
         return new CString(args, template);
     }
     
-    private final List<Expr<?>> args;
-    
-    private final Template template;
+    private final Custom<String> customMixin;
     
     public CString(List<Expr<?>> args, Template template){
-        this.args = args;
-        this.template = template;
+        customMixin = new CustomMixin<String>(args, template);
     }
     
     @Override
@@ -41,16 +38,16 @@ public class CString extends EString implements Custom<String> {
     
     @Override
     public Expr<?> getArg(int index) {
-        return getArgs().get(index);
+        return customMixin.getArg(index);
     }
 
     @Override
     public List<Expr<?>> getArgs() {
-        return args;
+        return customMixin.getArgs();
     }
-    
+
     @Override
     public Template getTemplate() {
-        return template;
+        return customMixin.getTemplate();
     }
 }
\ No newline at end of file
diff --git a/querydsl-core/src/main/java/com/mysema/query/types/custom/CustomMixin.java b/querydsl-core/src/main/java/com/mysema/query/types/custom/CustomMixin.java
new file mode 100644
index 000000000..e4bbb82cd
--- /dev/null
+++ b/querydsl-core/src/main/java/com/mysema/query/types/custom/CustomMixin.java
@@ -0,0 +1,44 @@
+/*
+ * Copyright (c) 2009 Mysema Ltd.
+ * All rights reserved.
+ * 
+ */
+package com.mysema.query.types.custom;
+
+import java.util.List;
+
+import com.mysema.query.types.Template;
+import com.mysema.query.types.expr.Expr;
+
+/**
+ * @author tiwe
+ *
+ * @param <T>
+ */
+class CustomMixin<T> implements Custom<T> {
+    
+    private final List<Expr<?>> args;
+    
+    private final Template template;
+    
+    public CustomMixin(List<Expr<?>> args, Template template){
+        this.args = args;
+        this.template = template;
+    }
+    
+    @Override
+    public Expr<?> getArg(int index) {
+        return getArgs().get(index);
+    }
+
+    @Override
+    public List<Expr<?>> getArgs() {
+        return args;
+    }
+
+    @Override
+    public Template getTemplate() {
+        return template;
+    }
+
+}