I've just upgraded my project to 11.1 with 4.0 framework, and I have a column that I am trying to use the new UnboundCheckBoxField.  I add the column using the properties menu in VS2010, with a key "Assign".  The grid displays correctly in VS2010 but errors when I try to run the page.  Below is the grid, and the 3 errors I recieve...

    <ig:WebDataGrid ID="WebDataGrid1" runat="server" AutoGenerateColumns="False" DataSourceID="SqlDataSource1" Width="100%" DataKeyFields="Row_ID">
        <Columns>
            <ig:UnboundCheckBoxField DataType="System.Nullable`1[[System.Boolean, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]]"
                HeaderChecked="False" Key="Assign">
                <Header Text="Assign" />
            </ig:UnboundCheckBoxField>
            <ig:BoundDataField DataFieldName="Row_ID" Key="Row_ID" Hidden="true">
                <Header Text="Row_ID" />
<Header Text="Row_ID"></Header>
            </ig:BoundDataField>
            <ig:BoundDataField DataFieldName="Prospect_ID" Key="Prospect_ID" Hidden="true">
                <Header Text="Prospect_ID" />
<Header Text="Prospect_ID"></Header>
            </ig:BoundDataField>
            <ig:BoundDataField DataFieldName="Biz_ID" Key="Biz_ID" Hidden="true">
                <Header Text="Biz_ID" />
<Header Text="Biz_ID"></Header>
            </ig:BoundDataField>
            <ig:BoundDataField DataFieldName="Call_Type_ID" Key="Call_Type_ID" Hidden="true">
                <Header Text="Call_Type_ID" />
<Header Text="Call_Type_ID"></Header>
            </ig:BoundDataField>
            <ig:BoundDataField DataFieldName="Full_Name" Key="Full_Name">
                <Header Text="Client" />
<Header Text="Client"></Header>
            </ig:BoundDataField>
            <ig:BoundDataField DataFieldName="Internal_Sys_Name" Key="Internal_Sys_Name">
                <Header Text="Call Type" />
<Header Text="Call Type"></Header>
            </ig:BoundDataField>
            <ig:BoundDataField DataFieldName="Call_Back_Date" Key="Call_Back_Date" DataType="System.DateTime" DataFormatString="{0:MM/dd/yyyy hh:mm tt}">
                <Header Text="Call Back Date" />
<Header Text="Call Back Date"></Header>
            </ig:BoundDataField>
            <ig:BoundDataField DataFieldName="Assigned_MA" Key="Assigned_MA">
                <Header Text="Assigned MA" />
<Header Text="Assigned MA"></Header>
            </ig:BoundDataField>
            <ig:BoundDataField DataFieldName="Current_MA" Key="Current_MA">
                <Header Text="Original MA" />
<Header Text="Original MA"></Header>
            </ig:BoundDataField>
            <ig:BoundDataField DataFieldName="Prospect_Full_Name" Key="Prospect_Full_Name">
                <Header Text="Prospect" />
<Header Text="Prospect"></Header>
            </ig:BoundDataField>
            <ig:BoundDataField DataFieldName="Company_Name" Key="Company_Name">
                <Header Text="Company" />
<Header Text="Company"></Header>
            </ig:BoundDataField>
        </Columns>

<ClientEvents Initialize="intializeGrid"></ClientEvents>
        <Behaviors>
            <ig:Paging PageSize="100">
            </ig:Paging>
            <ig:Filtering>
                <ColumnSettings>
                    <ig:ColumnFilteringSetting ColumnKey="Assigned_MA" Enabled="false" />
                    <ig:ColumnFilteringSetting ColumnKey="Current_MA" Enabled="false" />
                </ColumnSettings>
            </ig:Filtering>
            <ig:Sorting>
            </ig:Sorting>
            <ig:ColumnResizing>
            </ig:ColumnResizing>
            <ig:EditingCore AutoCRUD="False">
                <Behaviors>
                        <ig:CellEditing Enabled="true">
                            <ColumnSettings>
                                <ig:EditingColumnSetting ColumnKey="Assigned_MA" EditorID="WebDataGrid1_DropDownProvider1" ReadOnly="true" />
                                <ig:EditingColumnSetting ColumnKey="Current_MA" EditorID="WebDataGrid1_DropDownProvider1" ReadOnly="true" />
                                <ig:EditingColumnSetting ColumnKey="Full_Name" ReadOnly="true" />
                                <ig:EditingColumnSetting ColumnKey="Internal_Sys_Name" ReadOnly="true" />
                                <ig:EditingColumnSetting ColumnKey="Call_Back_Date" ReadOnly="true" />
                                <ig:EditingColumnSetting ColumnKey="Prospect_Full_Name" ReadOnly="true" />
                                <ig:EditingColumnSetting ColumnKey="Company_Name" ReadOnly="true" />
                            </ColumnSettings>
                        </ig:CellEditing>
                        <ig:RowDeleting />
                    </Behaviors>
            </ig:EditingCore>
        </Behaviors>
        <EditorProviders>
                <ig:DropDownProvider ID="WebDataGrid1_DropDownProvider1">
                    <EditorControl ID="EditorControl1" DropDownContainerMaxHeight="200px" EnableAnimations="False" EnableDropDownAsChild="False" runat="server" DataSourceID="SqlDataSource3" TextField="Full_Name" ValueField="Employee_ID">
<DropDownItemBinding TextField="Full_Name" ValueField="Employee_ID"></DropDownItemBinding>
                    </EditorControl>
                </ig:DropDownProvider>
            </EditorProviders>
            <ClientEvents Initialize="intializeGrid" />
            <EmptyRowsTemplate>
                        <div style="text-align:center; "><br/><br/>
                            <img src="../../images/WebDataGrid/attention.png" align="absmiddle"/>
                                No records returned.
                        </div>
                    </EmptyRowsTemplate>
                    <ErrorTemplate><div style="text-align:center;width:800px;">
                         <img src="../../images/WebDataGrid/error.png" align="absmiddle"/>
                                 An error has occurred! Please contact support.
                    </ErrorTemplate>
    </ig:WebDataGrid>

1. The 'DataType' property is read-only and cannot be set. 
2. Infragistics.Web.UI.GridControls.GridFieldCollection must have items of type 'Infragistics.Web.UI.GridControls.GridField'. 'Header' is of type 'System.Web.UI.HtmlControls.HtmlGenericControl'.
3. Literal content ('</ig:UnboundCheckBoxField>') is not allowed within a 'Infragistics.Web.UI.GridControls.GridFieldCollection'. 

If I try to remove the DataType attribute, the grid will then not display in VS.

Also, in code behind, how do I now determine if the row is checked if I am looping through the rows of the grid?