AjaxControlToolkit ExtenderControlBaseDesigner Class Requires T

Hello!

The previous version of ExtenderControlBaseDesigner does not require T as parameter. However, in recent versions you might notice that the class is declared with T. Here's a sample declaration:

AjaxControlToolkit.Design.ExtenderControlBaseDesigner<T> 

T means AjaxControlToolkit.ExtenderControlBase. In order for the Custom Extender Designer to work, supply the T with class that inherits the ExtenderControlBase. This sample class inherits the ExtenderControlBase:

public class CustomPanelExtender : ExtenderControlBase  
 {  
    //your code goes here....  
 }