Ordering Graphic Elements
Objects that are listed lower in the Objects and Timeline panel and in XAML are layered in front of other objects (Figure 4.29). This behavior is a major difference between Blend and other graphics programs that present layer order in a top down fashion.
Figure 4.29 Three objects with three different orders. (A) The circle is lower in the Objects and Timeline panel displaying it on top. (B) The triangle is lower in the Objects and Timeline panel displaying it on top. (C) The rectangle is lower in the Objects and Timeline panel displaying it visually on top.