I'm having trouble with AllowUpdate, all of the forum responses imply that AllowUpdate overrides all other settings and should prevent the whole grid from being modified, however it has no effect for me. This is easily illustrated by creating a simple grid with a single cell and setting the AllowUpdate property.

Create a brand new windows forms project, add a grid to the form, don't change any settings and add the following to the ctor:

 UltraDataSource ds = new UltraDataSource();
 ds.Band.Columns.Add("a");
 ds.Rows.Add();
 ultraGrid1.DataSource = ds;
 ultraGrid1.DisplayLayout.Override.AllowUpdate = Infragistics.Win.DefaultableBoolean.False;

When I run it and click on the single cell it enters edit mode! I'm using 2008.1

Thanks