Dynamically loading user control problem

[ym21]

hi all

i have a problem during loading the usercontrol dynamically.

 

I have a basic navigation system for one part of a website.

Along the left is a series of linkButtons and the right gets loaded with a different user control depending on which link is clicked.

After loaded the user control sucessfully depend on the link. But it will dissappeared after a postback event.

 

Any Idea on that?? Please help

 

thanks so much.....