バージョン

ExpansionIndicatorDisplayMode プロパティ

展開インジケーターが各レコード内に表示されるかどうかを決定します。
シンタックス
'宣言
 
Public Property ExpansionIndicatorDisplayMode As ExpansionIndicatorDisplayMode
public ExpansionIndicatorDisplayMode ExpansionIndicatorDisplayMode {get; set;}
解説

この設定を Record の Record.ExpansionIndicatorVisibility 取得アクセサーで使用し、展開インジケーターの解決済み可視性を決定します。しかし、Record で Record.ExpansionIndicatorVisibility プロパティを明示的に設定する方がこのプロパティより優先されます。

注： このプロパティは、展開インジケータがサポートされない特定のビューで無視されます。また、IsNestedDataDisplayEnabled プロパティが false に設定されている場合も無視されます。

使用例
The following snippet shows how to specify that records will be checked as soon as they are displayed to see if they have any child records. If no child records exist then the expansion indicators will not be shown. Depending on the data source this may cause some additional overhead. That is why the default is resolved to 'CheckOnExpand'.

public partial class Window1 : Window
{
    public Window1()
    {
        InitializeComponent();

        // Set the ExpansionIndicatorDisplayMode so that when a record
        // is displayed it will be checked to see if it has any child records.
        // The expansion indicator will only be displayed if the record has 
  // children.

        this.XamDataGrid1.FieldLayoutSettings.ExpansionIndicatorDisplayMode 
            = ExpansionIndicatorDisplayMode.CheckOnDisplay;

    }
}
<Window x:Class="Snippet_app_1.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:igDP="http://infragistics.com/DataPresenter"
    xmlns:igEditors="http://infragistics.com/Editors"
    xmlns:igWindows="http://infragistics.com/Windows"
    xmlns:igThemes="http://infragistics.com/Themes"
    Title="Window1" Height="300" Width="300">
    <Grid>
        <igDP:XamDataGrid x:Name="XamDataGrid1"
                        DataSource="{Binding Source={StaticResource OrdersDataSource}, XPath=Order}">

            <!-- These settings become the default for all FieldLayouts -->
            <igDP:XamDataGrid.FieldLayoutSettings>
                <!-- Set the ExpansionIndicatorDisplayMode so that when a record
                     is displayed it will be checked to see if it has any child
                     records. The expansions indicator will only be displayed 
                     if the record has children. -->
                <igDP:FieldLayoutSettings ExpansionIndicatorDisplayMode="CheckOnDisplay"/>
            </igDP:XamDataGrid.FieldLayoutSettings>
        </igDP:XamDataGrid>

    </Grid>
</Window>
Imports Infragistics.Windows.DataPresenter

Class Window1

    Public Sub New()

        ' This call is required by the Windows Form Designer.
        InitializeComponent()

        ' Set the ExpansionIndicatorDisplayMode so the when a 
        ' Record is displayed it wil be checked for any children
        ' an the expansions indicator will only be displayed 
        ' if the record has children
        Me.XamDataGrid1.FieldLayoutSettings.ExpansionIndicatorDisplayMode = ExpansionIndicatorDisplayMode.CheckOnDisplay

    End Sub
End Class
参照