diff --git a/slick.grid.js b/slick.grid.js
index 9c525b003..5e46580cf 100644
--- a/slick.grid.js
+++ b/slick.grid.js
@@ -598,9 +598,11 @@ if (typeof Slick === "undefined") {
 
                     $paneHeaderL.width(canvasWidthL);
                     $paneHeaderR.css('left', canvasWidthL);
+                    $paneHeaderR.css('width',viewportW - canvasWidthL);
 
                     $paneTopL.width(canvasWidthL);
                     $paneTopR.css('left', canvasWidthL);
+                    $paneTopR.css('width',viewportW - canvasWidthL);
 
                     $headerRowScrollerL.width(canvasWidthL);
                     $headerRowScrollerR.width(viewportW - canvasWidthL);
diff --git a/slick.groupitemmetadataprovider.js b/slick.groupitemmetadataprovider.js
index a50e6385b..a1d61576c 100644
--- a/slick.groupitemmetadataprovider.js
+++ b/slick.groupitemmetadataprovider.js
@@ -33,7 +33,8 @@
       toggleCssClass: "slick-group-toggle",
       toggleExpandedCssClass: "expanded",
       toggleCollapsedCssClass: "collapsed",
-      enableExpandCollapse: true
+      enableExpandCollapse: true,
+      groupColumns: false
     };
 
     options = $.extend(true, {}, _defaults, options);
@@ -108,27 +109,44 @@
       }
     }
 
-        function getRowMetadata(item) {
-            if (options.getRowMetadata) {
-                return options.getRowMetadata(item);
-            }
+    function getGroupRowMetadata(item) {
 
-            return null;
+        var columns = {
+            0: {
+                colspan: "*",
+                formatter: defaultGroupCellFormatter,
+                editor: null
+            }
+        };
+
+        if (options.groupColumns && options.groupColumns.length) {
+
+            var columns = options.groupColumns;
+
+            for (var i in columns) {
+                if (columns[i].hasOwnProperty("formatter")) {
+                    var column = columns[i];
+                    if (column.formatter == null) {
+                        column.formatter = defaultGroupCellFormatter;
+                    } else {
+                        if (typeof column.formatter == "function") {
+                            column.formatter = column.formatter;
+                        } else if (column.formatter == "empty") {
+                            column.formatter = function () {};
+                        } else {
+                            delete column.formatter;
+                        }
+                    }
+                }
+            }
         }
 
-    function getGroupRowMetadata(item) {
-      return {
-        selectable: false,
-        focusable: options.groupFocusable,
-        cssClasses: options.groupCssClass,
-        columns: {
-          0: {
-            colspan: "*",
-            formatter: defaultGroupCellFormatter,
-            editor: null
-          }
-        }
-      };
+        return {
+            selectable: false,
+            focusable: options.groupFocusable,
+            cssClasses: options.groupCssClass,
+            columns: columns
+        };
     }
 
     function getTotalsRowMetadata(item) {