Hello Pietro,

A possible approach to achieve this might be by using a 'CreationFilter'.

You could read about it at the following link: http://help.infragistics.com/Help/NetAdvantage/WinForms/2012.2/CLR4.0/html/Win_Creation_Filter.html. Here are some topics from our community which could also help you: http://community.infragistics.com/forums/t/34485.aspx, http://forums.infragistics.com/forums/t/47561.aspx http://community.infragistics.com/forums/t/58186.aspx, http://community.infragistics.com/forums/t/9989.aspx and http://community.infragistics.com/forums/t/50234.aspx. The above approach is not so recommended, because it features element resizing, creating or removing and could lead to some unexpected behaviors.

Please do not hesitate to ask if something comes up.