add a function of dialog

git-svn-id: https://plugins.svn.wordpress.org/wp-dialog/trunk@1031054 b8457f37-d9ea-0310-8a92-e5e31aec5664
fixed info

git-svn-id: https://plugins.svn.wordpress.org/wp-dialog/trunk@1031055 b8457f37-d9ea-0310-8a92-e5e31aec5664