Index: /CKEditor/trunk/_source/plugins/dialogui/plugin.js
===================================================================
--- /CKEditor/trunk/_source/plugins/dialogui/plugin.js	(revision 7296)
+++ /CKEditor/trunk/_source/plugins/dialogui/plugin.js	(revision 7297)
@@ -856,5 +856,7 @@
 				{
 					var html = [];
-					legendLabel && html.push( '<legend>' + legendLabel + '</legend>' );
+					legendLabel && html.push( '<legend' +
+						( elementDefinition.labelStyle ? ' style="' + elementDefinition.labelStyle + '"' : '' ) +
+						'>' + legendLabel + '</legend>' );
 					for ( var i = 0; i < childHtmlList.length; i++ )
 						html.push( childHtmlList[ i ] );