Hi Jafar,

Try with the following approach:

 
<Style x:Key="xyz" TargetType="{x:Type igDP:CellValuePresenter}" >
                <Setter Property="Width" Value="35"/>
                <Setter Property="MinWidth" Value="35"/>
                <Setter Property="MaxWidth" Value="35"/>
                <Setter Property="HorizontalAlignment" Value="Left"/>
                <Setter Property="Template">
                    <Setter.Value>
                        <ControlTemplate TargetType="{x:Type igDP:CellValuePresenter}">
                            <igDP:RecordSelector  MaxWidth="35" Visibility="Visible" />
                        </ControlTemplate>
                    </Setter.Value>
                </Setter>
            </Style>




            <igDP:XamDataGrid.FieldLayouts>
                <igDP:FieldLayout>
                    <igDP:Field Name="Name" />
                    <igDP:UnboundField Name="select" Label="" >
                        <igDP:UnboundField.Settings>
                            <igDP:FieldSettings CellClickAction="SelectRecord"  AllowResize="False" AllowEdit="False" AllowRecordFiltering="False" CellValuePresenterStyle="{StaticResource xyz}"/>
                        </igDP:UnboundField.Settings>
                    </igDP:UnboundField>
                    <igDP:Field Name="Age"/>
                </igDP:FieldLayout>
            </igDP:XamDataGrid.FieldLayouts>

Thanks,

George