Hi Konstantin,
sorry for the late answer. I just tested the page that Eyup have attached again with the same result. The tooltip of the text is encoded.
Here is the result taken from the browser (see the "title" attribute of the "a"-tag). I testet it with IE 11 and Chrome 49.0.2623.110 m. Both the same.
Telerik.Web.UI.dll version 2016.1.255.45
<
td
align
=
"left"
>
<
input
name
=
"RadGrid1$ctl00$ctl02$ctl00$AddNewRecordButton"
title
=
"äöü&"
class
=
"rgAdd"
id
=
"RadGrid1_ctl00_ctl02_ctl00_AddNewRecordButton"
type
=
"submit"
value
=
" "
>
<
a
title
=
"äöü&"
id
=
"RadGrid1_ctl00_ctl02_ctl00_InitInsertButton"
href
=
"javascript:__doPostBack('RadGrid1$ctl00$ctl02$ctl00$InitInsertButton','')"
>äöü&</
a
>
</
td
>