找到了解决问题的方法，这就是我加载TUC的方式.

错误:

Found the solution to the problem, which was how I was loading the TUC.

Incorrect:

xpcRegion = new ExpandCollapseRegion();

正确:

Correct:

xpcRegion = (ExpandCollapseRegion)LoadControl("ExpandCollapseRegion.ascx");

进行此简单更改即可解决该问题.另外，发现我可以使用CompiledTemplateBuilder()方法放弃对自定义ITemplate类的需要.真正简化了代码.

-安德鲁

Making this simple change took care of the problem. Also, found that I could forego the need for a custom ITemplate class by using the CompiledTemplateBuilder() method. Really simplifies the code.

-- Andrew