add binder class router

AppKit/CPKeyValueBinding.j

@@ -918,6 +918,7 @@ CPTextColorBinding                        = @"textColor";
 CPTitleBinding                            = @"title";
 CPToolTipBinding                          = @"toolTip";
 CPValueBinding                            = @"value";
+CPAttributedStringBinding                 = @"attributedString";
 CPValueURLBinding                         = @"valueURL";
 CPValuePathBinding                        = @"valuePath";
 CPDataBinding                             = @"data";

AppKit/CPTextView/CPTextView.j

@@ -164,6 +164,15 @@ var kDelegateRespondsTo_textShouldBeginEditing
     CPTimer                     _scrollingTimer;
 }
 
++ (Class)_binderClassForBinding:(CPString)aBinding
+{
+    if (aBinding === CPValueBinding)
+        return [_CPTextViewValueBinder class];
+    else if (aBinding === CPAttributedStringBinding)
+        return [_CPTextViewAttributedStringBinder class];
+
+    return [super _binderClassForBinding:aBinding];
+}
 
 #pragma mark -
 #pragma mark Class methods