Hi Pokorny,

     The UltraComboEditor is not designed to allow the disabling of individual items. You can of course submit that as a feature request here, ideas.infragistics.com. That being said you can achieve this functionality using the UltraCombo. Each row in the UltraCombo has an Activation property which you can set.

public enum Activation
{
 //  Allow Edit. The grid will attempt to edit the content of the object.
 AllowEdit = 0,

 //  Activate Only. The object may be selected (to copy and paste) but may not be edited.
 ActivateOnly = 1,

 //  Disabled. The object may not be activated and text may not be selected or edited.
 Disabled = 2,

 //  No Edit. The object may be activated(text highlighted), but cells cannot be edited or selected(to copy and paste).
 NoEdit = 3
}

Let me know if that helps,