Map Control Problem

Hello all,
I'm working on a project where maps in windows 8 store app is involved. Here's what happens with me:
on app start after the main page is loaded I add a map control. After that I get some data from a server using HTTPClient and put the retrieved data in a list. Then I project the list data on the map as markers.
The thing that happens is that I'm setting the zoom level & the map center values when doing so but, the map doesn't zoom or center as needed. I think that this operation is interrupted resulting to this unwanted behavior. So, any idea ??
Thanks in advance

Hi Motasim,
Which map control are you using, Bing map or some third party map controls? If you are using Bing maps I can help move to the correct forum for you otherwise you probably need ask at the map forum for a better support :)
Thanks for your understanding,
--James
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