So if you:

-turn on Row Summaries

-turn on Office 2007 theme

-The red 'X' will not work (clicking on it does nothing).  The green check works fine.

Anyone else had this problem?

This works fine:

                <igDP:XamDataGrid Name="_firstTabGrid" >

                    <igDP:XamDataGrid.FieldSettings>

                        <igDP:FieldSettings AllowSummaries="True" />

                    </igDP:XamDataGrid.FieldSettings>

                </igDP:XamDataGrid>

This does not:

                <igDP:XamDataGrid Name="_secondTabGrid" Theme="Office2k7Blue">

                     <igDP:XamDataGrid.FieldSettings>

                        <igDP:FieldSettings AllowSummaries="True"/>

                    </igDP:XamDataGrid.FieldSettings>

                </igDP:XamDataGrid>

Thanks for the help