Add CanUserResizeColumns property

src/ItemsRepeaterDataGrid/DataGrid.axaml

@@ -85,8 +85,14 @@
           <Separator Grid.Row="0" Grid.RowSpan="3" Grid.Column="1" Background="Gray" Width="1"/>
           <Separator Grid.Row="0" Grid.RowSpan="3" Grid.Column="3" Background="Gray" Width="1"/>
           <!-- Splitters -->
-          <GridSplitter Grid.Row="0" Grid.RowSpan="3" Grid.Column="1" Background="Transparent" ResizeDirection="Columns"/>
-          <GridSplitter Grid.Row="0" Grid.RowSpan="3" Grid.Column="3" Background="Transparent" ResizeDirection="Columns"/>
+          <GridSplitter Grid.Row="0" Grid.RowSpan="3" Grid.Column="1" 
+                        Background="Transparent" 
+                        ResizeDirection="Columns"
+                        IsEnabled="{TemplateBinding CanUserResizeColumns}"/>
+          <GridSplitter Grid.Row="0" Grid.RowSpan="3" Grid.Column="3" 
+                        Background="Transparent" 
+                        ResizeDirection="Columns"
+                        IsEnabled="{TemplateBinding CanUserResizeColumns}"/>
         </Grid>
       </ControlTemplate>
     </Setter>

src/ItemsRepeaterDataGrid/DataGrid.axaml.cs

@@ -16,6 +16,9 @@ namespace ItemsRepeaterDataGrid
         public static readonly StyledProperty<object?> SelectedItemProperty = 
             AvaloniaProperty.Register<DataGrid, object?>(nameof(SelectedItem));
 
+        public static readonly StyledProperty<bool> CanUserResizeColumnsProperty = 
+            AvaloniaProperty.Register<DataGrid, bool>(nameof(CanUserResizeColumns));
+
         public AvaloniaList<DataGridColumn> Columns
         {
             get => GetValue(ColumnsProperty);
@@ -33,5 +36,11 @@ namespace ItemsRepeaterDataGrid
             get => GetValue(SelectedItemProperty);
             set => SetValue(SelectedItemProperty, value);
         }
+
+        public bool CanUserResizeColumns
+        {
+            get => GetValue(CanUserResizeColumnsProperty);
+            set => SetValue(CanUserResizeColumnsProperty, value);
+        }
     }
 }

src/ItemsRepeaterDataGridDemo/Views/MainWindow.axaml

@@ -15,7 +15,8 @@
     <vm:MainWindowViewModel />
   </Design.DataContext>
 
-  <g:DataGrid Items="{Binding Items}">
+  <g:DataGrid Items="{Binding Items}" 
+              CanUserResizeColumns="True">
     <g:DataGrid.Columns>
       <!-- Column1 -->
       <g:DataGridTemplateColumn Header="Column1" Width="150">