Update ColumnHider extension to support ColumnSet

This is a customization I added to version 0.3.19 to allow the ColumnHider to work with grids that use ColumnSet.

extensions/ColumnHider.js

@@ -1,11 +1,12 @@
 define([
 	'dojo/_base/declare',
+    'dojo/_base/array',
 	'dojo/dom-construct',
 	'dojo/has',
 	'dojo/on',
 	'../util/misc',
 	'dojo/i18n!./nls/columnHider'
-], function (declare, domConstruct, has, listen, miscUtil, i18n) {
+], function (declare, array, domConstruct, has, listen, miscUtil, i18n) {
 /*
  *	Column Hider plugin for dgrid
  *	Originally contributed by TRT 2011-09-28
@@ -16,7 +17,7 @@ define([
  *	1. Menu placement is entirely based on CSS definitions.
  *	2. If you want columns initially hidden, you must add "hidden: true" to your
  *		column definition.
- *	3. This implementation does NOT support ColumnSet, and has not been tested
+ *	3. This implementation DOES support ColumnSet, but has not been tested
  *		with multi-subrow records.
  *	4. Column show/hide is controlled via straight up HTML checkboxes.  If you
  *		are looking for something more fancy, you'll probably need to use this
@@ -62,25 +63,44 @@ define([
 
 		_renderHiderMenuEntries: function () {
 			// summary:
-			//		Iterates over subRows for the sake of adding items to the
+			//		Iterates over subRows or columnSets for the sake of adding items to the
 			//		column hider menu.
-
-			var subRows = this.subRows,
-				first = true,
-				srLength, cLength, sr, c;
-
-			delete this._columnHiderFirstCheckbox;
-
-			for (sr = 0, srLength = subRows.length; sr < srLength; sr++) {
-				for (c = 0, cLength = subRows[sr].length; c < cLength; c++) {
-					this._renderHiderMenuEntry(subRows[sr][c]);
-					if (first) {
-						first = false;
-						this._columnHiderFirstCheckbox =
-							this._columnHiderCheckboxes[subRows[sr][c].id];
-					}
-				}
-			}
+
+            if (this.subRows && this.subRows.length) {
+                var subRows = this.subRows,
+                    first = true,
+                    srLength, cLength, sr, c;
+
+                delete this._columnHiderFirstCheckbox;
+
+                for (sr = 0, srLength = subRows.length; sr < srLength; sr++) {
+                    for (c = 0, cLength = subRows[sr].length; c < cLength; c++) {
+                        this._renderHiderMenuEntry(subRows[sr][c]);
+                        if (first) {
+                            first = false;
+                            this._columnHiderFirstCheckbox =
+                                this._columnHiderCheckboxes[subRows[sr][c].id];
+                        }
+                    }
+                }
+            }
+            else if (this.columnSets && this.columnSets.length) {
+                // Loop through each this.columnSets
+                array.forEach(this.columnSets, function (columnSet) {
+                    // Loop through each columnSet
+                    array.forEach(columnSet, function (columnSetColumns) {
+                        // Loop through each columnSetColumns
+                        array.forEach(columnSetColumns, function (column) {
+                            // Render a checkbox for each column
+                            this._renderHiderMenuEntry(column);
+                            // Keep track of the first checkbox
+                            this._columnHiderFirstCheckbox =
+                                this._columnHiderFirstCheckbox ||
+                                this._columnHiderCheckboxes[column.id];
+                        }, this);
+                    }, this);
+                }, this);
+            }
 		},
 
 		_renderHiderMenuEntry: function (col) {