Here's a simple solution implemented entirely in XAML:
<!-- Bind ItemsSource to the appropriate collection -->
<ItemsControl ItemsSource="{Binding Points}">
<ItemsControl.ItemContainerStyle>
<Style TargetType="FrameworkElement">
<Setter Property="Canvas.Left" Value="{Binding X}" />
<Setter Property="Canvas.Top" Value="{Binding Y}" />
</Style>
</ItemsControl.ItemContainerStyle>
<ItemsControl.ItemTemplate>
<DataTemplate DataType="Point">
<Ellipse Fill="Blue"
Width="8"
Height="8"
Margin="-4,-4,4,4" />
</DataTemplate>
</ItemsControl.ItemTemplate>
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<Canvas IsItemsHost="True" />
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
</ItemsControl>