Public Sub New()
　InitializeComponent()
　' データ設定
　Me.c1DataGrid1.ItemsSource = New StockCollection()
　' イベント設定
　AddHandler c1DataGrid1.RowResized, AddressOf c1DataGrid1_RowResized
End Sub

Private Sub c1DataGrid1_RowResized(sender As Object, e As C1.WPF.DataGrid.DataGridRowEventArgs)
　Dispatcher.BeginInvoke(New Action(Sub()
　　　Dim rowHeight As Double = e.Row.ActualHeight
　　　' 選択中の行をリサイズ
　　　For Each drow As C1.WPF.DataGrid.DataGridRow In c1DataGrid1.Selection.SelectedRows
　　　　drow.Height = New C1.WPF.DataGrid.DataGridLength(rowHeight)
　　　Next
　　End Sub),
　　System.Windows.Threading.DispatcherPriority.Render)
End Sub

public KB81211()
{
　InitializeComponent();
　// テストデータ設定
　this.c1DataGrid1.ItemsSource = new StockCollection();
　// イベント設定
　c1DataGrid1.RowResized += c1DataGrid1_RowResized;
}

void c1DataGrid1_RowResized(object sender, C1.WPF.DataGrid.DataGridRowEventArgs e)
{
　if (c1DataGrid1.Selection.SelectedRows.Contains(e.Row))
　{
　　Dispatcher.BeginInvoke(new Action(() => {
　　　double rowHeight = e.Row.ActualHeight;
　　　// 選択中の行をリサイズ
　　　foreach (C1.WPF.DataGrid.DataGridRow drow in c1DataGrid1.Selection.SelectedRows)
　　　{
　　　　drow.Height = new C1.WPF.DataGrid.DataGridLength(rowHeight);
　　　}
　　}), System.Windows.Threading.DispatcherPriority.Render);
　}
}