Update sample to use scrolltoitem

Author: Redth

Sample/VirtualListViewSample/ObservableCollectionPage.xaml

@@ -6,10 +6,10 @@
 	xmlns:local="clr-namespace:VirtualListViewSample"
 	xmlns:vlv="clr-namespace:Microsoft.Maui.Controls;assembly=VirtualListView"
 	Title="ObservableCollectionPage">
-	<Grid RowDefinitions="*,Auto" ColumnDefinitions="*,Auto" Padding="20">
+	<Grid RowDefinitions="*,Auto" ColumnDefinitions="*,Auto,Auto" Padding="20">
 		<vlv:VirtualListView
 			Grid.Row="0"
-			Grid.Column="0" Grid.ColumnSpan="2"
+			Grid.Column="0" Grid.ColumnSpan="3"
 			x:Name="vlv"
 			OnSelectedItemsChanged="vlv_SelectedItemsChanged"
 			SelectionMode="Multiple">
@@ -39,5 +39,6 @@
 
 		<Entry x:Name="entryItem" Grid.Row="1" Grid.Column="0" Placeholder="Item" />
 		<Button Grid.Row="1" Grid.Column="1" Text="Add" Clicked="Button_Clicked" />
+        <Button Grid.Row="1" Grid.Column="2" Text="Scroll To" Clicked="ScrollTo_Clicked" />
 	</Grid>
 </ContentPage>

Sample/VirtualListViewSample/ObservableCollectionPage.xaml.cs

@@ -11,7 +11,7 @@ public ObservableCollectionPage()
 
 		Adapter = new ObservableCollectionAdapter<string>(Items);
 
-		for (int i = 0; i < 10; i++)
+		for (int i = 0; i < 100; i++)
 		{
 			Items.Add($"Item: {i}");
 		}
@@ -61,4 +61,16 @@ private void vlv_SelectedItemsChanged(object sender, SelectedItemsChangedEventAr
 			Items.Remove(item);
 		}
 	}
+
+	private void ScrollTo_Clicked(object sender, EventArgs e)
+	{
+		if (!string.IsNullOrEmpty(entryItem.Text))
+		{
+			var item = Items.FirstOrDefault(i => i.Equals(entryItem.Text, StringComparison.InvariantCultureIgnoreCase));
+
+			var itemIndex = Items.IndexOf(item);
+
+			vlv.ScrollToItem(new ItemPosition(0, itemIndex), true);
+		}
+	}
 }