can't config Buttons at form's bottom .net vesion

i used http://support.dhtmlx.com/x-files/conne%20…%20072011.zip DOTNET vesion and i remove Buttons(delete) at detail form’s bottom but it can’t work? how to figure out?
any idea is welcome! thanks !

a) There are more new version of connector
dhtmlx.com/x/download/regula … or_net.zip

b) it is not clear what have you done and which issue occurs. If it is still actual - please provide more details.