Use ListBox instead of ItemsRepeater

src/ItemsRepeaterDataGrid/DataGrid.axaml

@@ -11,6 +11,7 @@
           <!-- DataGridColumnHeadersPresenter -->
           <Grid Name="PART_ColumnHeaders" />
           <!-- DataGridRowsPresenter -->
+          <!-- NOTE: If !USE_LISTBOX
           <ScrollViewer Name="PART_ScrollViewer">
             <ItemsRepeater Name="PART_ItemsRepeater" Items="{TemplateBinding Items}">
               <ItemsRepeater.Layout>
@@ -18,6 +19,26 @@
               </ItemsRepeater.Layout>
             </ItemsRepeater>
           </ScrollViewer>
+          -->
+          <ListBox Name="PART_ListBox" Items="{TemplateBinding Items}" SelectedItem="{TemplateBinding SelectedItem}">
+            <ListBox.Styles>
+              <Style Selector="ListBox">
+                <Setter Property="Background" Value="Transparent"/>
+              </Style>
+            </ListBox.Styles>
+            <ListBox.Styles>
+              <Style Selector="ListBoxItem">
+                <Setter Property="HorizontalContentAlignment" Value="Stretch"/>
+                <Setter Property="Margin" Value="0"/>
+                <Setter Property="Padding" Value="0"/>
+              </Style>
+            </ListBox.Styles>
+            <ListBox.ItemsPanel>
+              <ItemsPanelTemplate>
+                <VirtualizingStackPanel Orientation="Vertical"/>
+              </ItemsPanelTemplate>
+            </ListBox.ItemsPanel>
+          </ListBox>
         </Grid>
       </ControlTemplate>
     </Setter>

src/ItemsRepeaterDataGrid/DataGrid.axaml.cs

@@ -1,4 +1,5 @@
-using System.Collections;
+#define USE_LISTBOX
+using System.Collections;
 using System.Collections.Generic;
 using Avalonia;
 using Avalonia.Collections;
@@ -14,9 +15,12 @@ namespace ItemsRepeaterDataGrid
         private List<Control> _rootChildren = new List<Control>();
         private Grid? _columnHeaders;
         private List<Control> _columnHeadersChildren = new List<Control>();
+#if !USE_LISTBOX
         private ScrollViewer? _scrollViewer;
         private ItemsRepeater? _itemsRepeater;
-
+#else
+        private ListBox? _listBox;
+#endif
         public static readonly StyledProperty<AvaloniaList<DataGridColumn>> ColumnsProperty = 
             AvaloniaProperty.Register<DataGrid, AvaloniaList<DataGridColumn>>(nameof(Columns), new AvaloniaList<DataGridColumn>());
 
@@ -59,9 +63,12 @@ namespace ItemsRepeaterDataGrid
 
             _root = e.NameScope.Find<Grid>("PART_Root");
             _columnHeaders = e.NameScope.Find<Grid>("PART_ColumnHeaders");
+#if !USE_LISTBOX
             _scrollViewer = e.NameScope.Find<ScrollViewer>("PART_ScrollViewer");
             _itemsRepeater = e.NameScope.Find<ItemsRepeater>("PART_ItemsRepeater");
-
+#else
+            _listBox = e.NameScope.Find<ListBox>("PART_ListBox");
+#endif
             InvalidateRoot();
             InvalidateColumnHeaders();
             InvalidateScrollViewer();
@@ -138,7 +145,7 @@ namespace ItemsRepeaterDataGrid
             _rootChildren.Add(horizontalSeparator);
 
             // Set ItemsRepeater template
-
+#if !USE_LISTBOX
             if (_itemsRepeater is { })
             {
                 _itemsRepeater.ItemTemplate = new FuncDataTemplate<object>(
@@ -147,7 +154,16 @@ namespace ItemsRepeaterDataGrid
                         [!DataGridRow.ColumnsProperty] = this[!DataGrid.ColumnsProperty]
                     });
             }
-
+#else
+            if (_listBox is { })
+            {
+                _listBox.ItemTemplate = new FuncDataTemplate<object>(
+                    (_, _) => new DataGridRow()
+                    {
+                        [!DataGridRow.ColumnsProperty] = this[!DataGrid.ColumnsProperty]
+                    });
+            }
+#endif
             foreach (var columnIndex in splitterColumnIndexes)
             {
                 // Generate Root Horizontal Separator's
@@ -234,6 +250,7 @@ namespace ItemsRepeaterDataGrid
 
         private void InvalidateScrollViewer()
         {
+#if !USE_LISTBOX
             if (_scrollViewer is null)
             {
                 return;
@@ -244,6 +261,18 @@ namespace ItemsRepeaterDataGrid
             _scrollViewer.SetValue(Grid.RowProperty, 2);
             _scrollViewer.SetValue(Grid.ColumnProperty, 0);
             _scrollViewer.SetValue(Grid.ColumnSpanProperty,  columns.Count + (columns.Count - 1));
+#else
+            if (_listBox is null)
+            {
+                return;
+            }
+ 
+            var columns = Columns;
+
+            _listBox.SetValue(Grid.RowProperty, 2);
+            _listBox.SetValue(Grid.ColumnProperty, 0);
+            _listBox.SetValue(Grid.ColumnSpanProperty,  columns.Count + (columns.Count - 1));
+#endif
         }
     }
 }

src/ItemsRepeaterDataGrid/DataGridRow.axaml

@@ -11,10 +11,12 @@
       </ControlTemplate>
     </Setter>
   </Style>
+  <!-- NOTE: If !USE_LISTBOX
   <Style Selector="g|DataGridRow /template/ Grid#PART_Root">
     <Setter Property="Background" Value="Transparent" />
   </Style>
   <Style Selector="g|DataGridRow:pointerover /template/ Grid#PART_Root">
     <Setter Property="Background" Value="LightGray" />
   </Style>
+  -->
 </Styles>