Dependency Property of Style type - wpf

Question

I am wanting to expose a Style as a dependency property. Basically there is a rectangle indicator in the middle and the using control is going to expose a style dependency property for containing controls to set. It would allow those containing controls to provide a style for coloring based on their own knowledge of their items.
<ItemsControl ItemsSource="{Binding Rows}">
<ItemsControl.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<TextBlock Text="{Binding RowName}"/>
<ItemsControl ItemsSource="{Binding Statuses}">
<Rectangle Style="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=Grid}, Path=RectangleStyle}"/>
</ItemsControl>
</StackPanel>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
The dependency property in the code-behind of the custom control.
public Style RectangleStyle
{
get { return (Style)GetValue(RectangleStyleProperty); }
set { SetValue(RectangleStyleProperty, value); }
}
public static readonly DependencyProperty RectangleStyleProperty =
DependencyProperty.Register("RectangleStyle", typeof(Style), typeof(MyControl), new PropertyMetadata(null));
This would then be used like:
<MyControl>
<MyControl.RectangleStyle>
<Style TargetType="{x:Type Rectangle}">
<Setter Property="Fill" Value="Red"/>
</Style>
</MyControl.RectangleStyle>
</MyControl>
This is not working at all and I'm not sure if my approach is even correct.

Answer 1

Stupid syntax error. I needed to set the ItemsTemplate for the Inner ItemsControl. I was setting the content of the ItemsControl to be the Rectangle.
<ItemsControl ItemsSource="{Binding Rows}">
<ItemsControl.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<TextBlock Text="{Binding RowName}"/>
<ItemsControl ItemsSource="{Binding Statuses}">
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<StackPanel Orientation="Horizontal"/>
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
<ItemsControl.ItemTemplate>
<DataTemplate>
<Rectangle Style="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=Grid}, Path=RectangleStyle}"/>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
</StackPanel>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>