Button: Restrict DOM querying to labels. Fixes #5810 - Buttonset and applet error.

Author: scottgonzalez

ui/jquery.ui.button.js

@@ -196,7 +196,7 @@ $.widget( "ui.button", {
 			// we don't search against the document in case the element
 			// is disconnected from the DOM
 			this.buttonElement = this.element.parents().last()
-				.find( "[for=" + this.element.attr("id") + "]" );
+				.find( "label[for=" + this.element.attr("id") + "]" );
 			this.element.addClass( "ui-helper-hidden-accessible" );
 
 			var checked = this.element.is( ":checked" );