Index: wp-admin/js/theme-preview.dev.js
===================================================================
--- wp-admin/js/theme-preview.dev.js	(revision 19823)
+++ wp-admin/js/theme-preview.dev.js	(working copy)
@@ -55,9 +55,9 @@
 	} );
 
 	// Theme details
-	$('.theme-detail').click(function () {
+	$('#availablethemes').on( 'click', 'a.theme-detail', function (event) {
 		$(this).siblings('.themedetaildiv').toggle();
 		return false;
-	});
+	} );
 
 });