or
<input type="checkbox" runat="server" name="ChkAdmin" value="Chk_Admin" id="Chk_Admins" onclick="Chk_AdminClick()" />Adminfunction Chk_AdminClick() { debugger; var chkBox = document.getElementsId('Chk_Admins'); var Checked = document.getElementsId('Chk_Admins').checked; var chkBox1 = document.getElementsByName('ChkAdmin'); if(chkBox1.Checked == true) { setPrives("admin"); } else {setPrives("none");} }<telerik:GridHTMLEditorColumn UniqueName="Notes" SortExpression="Notes" HeaderText="HTMLEditorColumn" DataField="Notes" FooterText="HTMLEditorColumn footer" HeaderStyle-Width="200px"></telerik:GridHTMLEditorColumn>
MarkFirstMatch
="false"
Attachment1 is firing the event.