We have a published mxd defined with a symbology that has symbol levels (Layer properties->Symbology, Unique Values->Advanced->Symbol Levels).
When the layer is displayed in the WPF map control the symbol levels are not displayed as defined in the MXD.
After further investigating it we noticed that the symbol levels in the map control are set according to the OBJECTID value and not by the determined symbol levels.
Have you noticed this problem? Is there a solution for it?