Currently, the behavior of the wrap panel is the same as in WPF. However, it would be a nice addition to be able to center (or right-align) the children of a wrap panel when there are multiple lines.

To succeed, I simply duplicated the WrapPanel class and added a "float offset" argument to the ArrangeLine method. Then I do "Point(x + offset, y)" to arrange the child.
In offset, I send :
(finalSize.width - accumW) * 0.5f => to center the child
(finalSize.width - accumW) => to right-align

As I simply duplicated the current WrapPanel code, maybe it would be better to include this change in the source code directly, in a next version? With a property to enable it or not. It would be great!