Moe,

 

We support multiple uploads in the v2.0 , and changed server code to support this future.

 

That changes cause your issue.

 

Now I think the best solution for your code is that :

 

this._isbinded=false; //decalre this member at the class code.

this.Page.PreRenderComplete+=delegate{

   if(this._isbinded)return;

   this.FindParent<FieldEditor>().RefreshParent();