This post shows you How to call the extension method via the assigned delegate in C#.

For example:

public class MyControl
{

}

public static class MyControlExt
{
    public static void FindElement(this MyControl myControl)
    {

    }
}

You can call the extension method via the assigned delegate by passing the one parameter.

Action<MyControl> action = MyControlExt.FindElement;
MyControl myControl = new MyControl();
action(myControl);