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>

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.

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;

        }

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

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.