Index: CKEditor/branches/features/aria/_source/plugins/dialogui/plugin.js
===================================================================
--- CKEditor/branches/features/aria/_source/plugins/dialogui/plugin.js	(revision 4966)
+++ CKEditor/branches/features/aria/_source/plugins/dialogui/plugin.js	(revision 4969)
@@ -34,4 +34,21 @@
 		{
 			return new CKEDITOR.ui.dialog[elementDefinition.type]( dialog, elementDefinition, output );
+		}
+	},
+	containerBuilder =
+	{
+		build : function( dialog, elementDefinition, output )
+		{
+			var children = elementDefinition.children,
+				child,
+				childHtmlList = [],
+				childObjList = [];
+			for ( var i = 0 ; ( i < children.length && ( child = children[i] ) ) ; i++ )
+			{
+				var childHtml = [];
+				childHtmlList.push( childHtml );
+				childObjList.push( CKEDITOR.dialog._.uiElementBuilders[ child.type ].build( dialog, child, childHtml ) );
+			}
+			return new CKEDITOR.ui.dialog[ elementDefinition.type ]( dialog, childObjList, childHtmlList, output, elementDefinition );
 		}
 	},
@@ -780,5 +797,42 @@
 					htmlList.push( [ theirMatch[1], ' ', myMatch[1] || '', theirMatch[2] ].join( '' ) );
 				};
-			})()
+			})(),
+
+			/**
+			 * Form fieldset for grouping dialog UI elements.
+			 * @constructor
+			 * @extends CKEDITOR.ui.dialog.uiElement
+			 * @param {CKEDITOR.dialog} dialog Parent dialog object.
+			 * @param {Array} childObjList
+			 * Array of {@link CKEDITOR.ui.dialog.uiElement} objects inside this
+			 * container.
+			 * @param {Array} childHtmlList
+			 * Array of HTML code that correspond to the HTML output of all the
+			 * objects in childObjList.
+			 * @param {Array} htmlList
+			 * Array of HTML code that this element will output to.
+			 * @param {CKEDITOR.dialog.uiElementDefinition} elementDefinition
+			 * The element definition. Accepted fields:
+			 * <ul>
+			 * 	<li><strong>label</strong> (Optional) The legend of the this fieldset.</li>
+			 * 	<li><strong>children</strong> (Required) An array of dialog field definitions which will be grouped inside this fieldset. </li>
+			 * </ul>
+			 */
+			fieldset : function( dialog, childObjList, childHtmlList, htmlList, elementDefinition )
+			{
+				var legendLabel = elementDefinition.label;
+				/** @ignore */
+				var innerHTML = function()
+				{
+					var html = [];
+					legendLabel && html.push( '<legend>' + legendLabel + '</legend>' );
+					for ( var i = 0; i < childHtmlList.length; i++ )
+						html.push( childHtmlList[ i ] );
+					return html.join( '' );
+				};
+
+				this.fieldset = new CKEDITOR.ui.dialog.uiElement( dialog, elementDefinition, htmlList, 'fieldset', null, null, innerHTML );
+			}
+
 		}, true );
 
@@ -1344,3 +1398,4 @@
 	CKEDITOR.dialog.addUIElement( 'fileButton', commonBuilder );
 	CKEDITOR.dialog.addUIElement( 'html', commonBuilder );
+	CKEDITOR.dialog.addUIElement( 'fieldset', containerBuilder );
 })();
Index: CKEditor/branches/features/aria/_source/plugins/flash/dialogs/flash.js
===================================================================
--- CKEditor/branches/features/aria/_source/plugins/flash/dialogs/flash.js	(revision 4966)
+++ CKEditor/branches/features/aria/_source/plugins/flash/dialogs/flash.js	(revision 4969)
@@ -581,43 +581,46 @@
 						},
 						{
-							type : 'vbox',
-							padding : 0,
-							children :
-							[
-								{
-									type : 'html',
-									html : CKEDITOR.tools.htmlEncode( editor.lang.flash.flashvars )
-								},
-								{
-									type : 'checkbox',
-									id : 'menu',
-									label : editor.lang.flash.chkMenu,
-									'default' : true,
-									setup : loadValue,
-									commit : commitValue
-								},
-								{
-									type : 'checkbox',
-									id : 'play',
-									label : editor.lang.flash.chkPlay,
-									'default' : true,
-									setup : loadValue,
-									commit : commitValue
-								},
-								{
-									type : 'checkbox',
-									id : 'loop',
-									label : editor.lang.flash.chkLoop,
-									'default' : true,
-									setup : loadValue,
-									commit : commitValue
-								},
-								{
-									type : 'checkbox',
-									id : 'allowFullScreen',
-									label : editor.lang.flash.chkFull,
-									'default' : true,
-									setup : loadValue,
-									commit : commitValue
+							type : 'fieldset',
+							label : CKEDITOR.tools.htmlEncode( editor.lang.flash.flashvars ),
+							children :
+							[
+								{
+									type : 'vbox',
+									padding : 0,
+									children :
+									[
+										{
+											type : 'checkbox',
+											id : 'menu',
+											label : editor.lang.flash.chkMenu,
+											'default' : true,
+											setup : loadValue,
+											commit : commitValue
+										},
+										{
+											type : 'checkbox',
+											id : 'play',
+											label : editor.lang.flash.chkPlay,
+											'default' : true,
+											setup : loadValue,
+											commit : commitValue
+										},
+										{
+											type : 'checkbox',
+											id : 'loop',
+											label : editor.lang.flash.chkLoop,
+											'default' : true,
+											setup : loadValue,
+											commit : commitValue
+										},
+										{
+											type : 'checkbox',
+											id : 'allowFullScreen',
+											label : editor.lang.flash.chkFull,
+											'default' : true,
+											setup : loadValue,
+											commit : commitValue
+										}
+									]
 								}
 							]
