diff --git a/core/model/Model.js b/core/model/Model.js
index 9bdc468cb..824a12752 100644
--- a/core/model/Model.js
+++ b/core/model/Model.js
@@ -377,15 +377,15 @@ define([
 		},
 
 		_sizeAll: function(parentId){
-			var size = this.size(parentId), i, childId,
-				count = 0;
+			var size = this.size(parentId),
+				count = 0,
+				i, childId;
 
 			size = size === -1 ? 0 : size;
 			count += size;
 			
-			for(i = 0; i < size; i++){
+			for(i = 0; i < size; i++) {
 				childId = this.indexToId(i, parentId);
-				console.log(childId);
 				count += this._sizeAll(childId);
 			}
 
diff --git a/core/model/extensions/Modify.js b/core/model/extensions/Modify.js
index 3552b4429..a29281c5f 100644
--- a/core/model/extensions/Modify.js
+++ b/core/model/extensions/Modify.js
@@ -140,10 +140,13 @@ define([
 		byId: function(id){
 			var t = this,
 				c = t.inner._call('byId', arguments);
-			if(!c){ return c; }
+			if(!c) return c;
 			var d = lang.mixin({}, c);
+			
 			d.rawData = lang.mixin({}, d.rawData, t._lazyRawData[id]);
-			d.data = lang.mixin({}, d.data, t._lazyData[id]);		
+			if (d.data) {
+				d.data = lang.mixin({}, d.data, t._lazyData[id]);
+			}
 			return d;
 		},
 		
@@ -151,11 +154,14 @@ define([
 			var t = this,
 				c = t.inner._call('byIndex', arguments),
 				id = t.inner._call('indexToId', arguments);
-			if(!c){ return c; }
+
+			if(!c) return c;
 			var d = lang.mixin({}, c);
 			
 			d.rawData = lang.mixin({}, d.rawData, t._lazyRawData[id]);
-			d.data = lang.mixin({}, d.data, t._lazyData[id]);
+			if (d.data) {
+				d.data = lang.mixin({}, d.data, t._lazyData[id]);
+			}
 			return d;
 		},
 		
diff --git a/support/Summary.js b/support/Summary.js
index d990fa871..9bab91455 100644
--- a/support/Summary.js
+++ b/support/Summary.js
@@ -54,6 +54,11 @@ define([
 					firstIdx = 0,
 					lastIdx = 0;
 
+				if (g.sizeHandler && typeof g.sizeHandler === 'function') {
+					size = g.sizeHandler(g);
+				}
+
+				size = g.tree? g.model._sizeAll() : size;
 				if(pagination){
 					cp = pagination.currentPage();
 					firstIdx = pagination.firstIndexInPage(cp) + 1;
diff --git a/tests/support/common.css b/tests/support/common.css
index 0cf90a083..597dfb096 100644
--- a/tests/support/common.css
+++ b/tests/support/common.css
@@ -11,6 +11,12 @@ body {
 	margin: 5em;
 }
 
+h3 {
+	color: blue;
+	margin: 0;
+	padding: 0;
+}
+
 .title {
 	font-size: large;
 	font-weight: bolder;
diff --git a/tests/test_grid_pagination.html b/tests/test_grid_pagination.html
index ee9d31b8c..7c0c5a0a4 100644
--- a/tests/test_grid_pagination.html
+++ b/tests/test_grid_pagination.html
@@ -36,10 +36,16 @@ <h2>Pagination Grid with API only</h2>
 		]
 	'></div>
 	<h2>Link-button style PaginationBar</h2>
+	<h3>using self defined size handler to calculate row count</h3>
 	<div id='grid2' jsid='grid2' data-dojo-type='gridx.Grid' data-dojo-props='
 		cacheClass: "gridx/core/model/cache/Sync",
 		store: store,
 		structure: layout,
+		//self defined size handler
+		sizeHandler: function() {
+			console.log("in size handler");
+			return 123;
+		},
 		paginationBarMessage: "${2} to ${3} of ${0} items ${1} items selected",
 		modules: [
 			"gridx/modules/Pagination",