I am sorry to say that we don’t support this feature right now; we have added this to task lists, maybe we will add it to the next public release products edition. Another thing is that user still couldn’t implemnt this requirement even though we have added these events, that’s because we request the tile images in the asynchronization mode, so users don’t know when the tile image will be back.
I am sorry to say that there is no way to implement it right now. In fact, in our SilverlightEdition product we use image control to render tile image, so we don’t know the accurate time when tile image renders, and for performance reason, we don’t support it now. Maybe we will support it in the next public released version.