WPF graph children z-order

I have a canvas added to a WPF graph's children in XAML to drawing various text blocks and lines. Later in code I add RangeCursors. The RangeCursors paint on top of the canvas, but I'd like the canvas on top. Is there a way to control this? I've tried both adding the RangeCursors at the end of the children collection and inserting at position 0, but the result is the same (RangeCursors on top).