Alex,

I tried your way but seems like it doesn't work...I attached my codes. can u pls take a look.

Thanks a lot.   

<igDP:XamDataGrid Grid.Row="1"
                        x:Name="xamDataGrid"
                        Theme="Aero"
                        AutoFit="False"
                        ContextMenu="{x:Null}"
                        SnapsToDevicePixels="True"
                        ScrollingMode="Immediate"
                        AllowDrop="True"
                        RecordContainerGenerationMode="Recycle"
                        CellContainerGenerationMode="Recycle"
                                RecordLoadMode="LoadOnDemand"
                        Background="Gray"
                       
                        DragOver="OnDragOver"
                        Drop="OnDataDrop"
                        PreviewMouseDown="OnXamDataGridPreviewMouseDown"
                        PreviewMouseMove="OnXamDataGridPreviewMouseMove"
                        PreviewMouseUp="OnXamDataGridPreviewMouseUp"
                        MouseDoubleClick="OnGridMouseDoubleClick"
                        MouseRightButtonDown="OnGridMouseRightButtonDown"
                        IsGroupByAreaExpanded="False">

        <igDP:XamDataGrid.Resources>
          <Style TargetType="{x:Type igDP:RecordSelector}">
            <Setter Property="Template">
              <Setter.Value>
                <ControlTemplate TargetType="{x:Type igDP:RecordSelector}">
                  <CheckBox
                    HorizontalAlignment="Center"
                    VerticalAlignment="Center"
                    IsChecked="{Binding Path=DataItem.IsChecked}"
                    Checked="OnChecked"
                    Unchecked="OnUnChecked"
                  >
                  </CheckBox>
                </ControlTemplate>
              </Setter.Value>
            </Setter>
          </Style>
          <Style TargetType="{x:Type igDP:DataRecordPresenter}">
            <Setter Property="Margin" Value="80,0,0,0"/>
          </Style>
        </igDP:XamDataGrid.Resources>
       
        <igDP:XamDataGrid.FieldLayoutSettings>
          <igDP:FieldLayoutSettings
                  DataRecordSizingMode="SizedToContentAndIndividuallySizable"
                  AutoGenerateFields="True"
                  RecordSelectorLocation="LeftOfCellArea"
                  ResizingMode="Default"
                 
                  SelectionTypeRecord="Extended"
                  SelectionTypeField="Extended"
                  DataRecordPresenterStyle="{StaticResource headerStyle}"
                  DataRecordCellAreaStyle="{StaticResource rowStyle}"
                  SelectionTypeCell="Extended"/>
        </igDP:XamDataGrid.FieldLayoutSettings>
        <igDP:XamDataGrid.FieldSettings>
          <igDP:FieldSettings
                      AllowEdit="False"
                      CellClickAction="SelectRecord"
                      CellMinWidth="0"
                      AllowCellVirtualization="true"
                      CellValuePresenterStyle="{StaticResource cellStyle}"
                      LabelPresenterStyle="{StaticResource columnStyle}"/>
          <!--CellValuePresenterStyle="{StaticResource cellStyle}"-->
        </igDP:XamDataGrid.FieldSettings>
      </igDP:XamDataGrid>

That is because you have two styles for the DataRecordPresenter. WPF supports only one local style. You have to merge the following into one single style:

DataRecordPresenterStyle="{StaticResource headerStyle}" and

<Style TargetType="{x:Type igDP:DataRecordPresenter}">
            <Setter Property="Margin" Value="80,0,0,0"/>
          </Style>

Alex.

Try changing both like CellWidht and LabelWidth

Note: make sure you have defined the fields and CellWidth and LabelWidth in the xaml, otherwise these numbers will be NaN and nothing will happen.

Alex.

also tried cellwidth...no luck...guess the way i set width of cell is wrong?

I wrote handler as below...But it doesn't work...any idea?

Thanks

        void OnInitializeRecord(object sender, Infragistics.Windows.DataPresenter.Events.InitializeRecordEventArgs e)
        {
            DataRecord dr = e.Record as DataRecord;

            if (dr != null && dr.ParentRecord != null)
                dr.Cells[0].Field.Settings.LabelWidth = dr.Cells[0].Field.Settings.LabelWidth - 20;

        }

If you will not be changing this cell's width, you can set it in the XAML. If you need to change it in runtime, you can use InitializeRecord event.

Alex.