add generic Action<T> delegates to a list

Is it possible to add a generic delegate Action to a List collection? I need some kind of simple messaging system for a Silverlight application.

UPDATE The following is what i realy "want"

class SomeClass<T>
{
    public T Data { get; set; }
    // and more ....
}

class App
{
    List<Action<SomeClass<T>>> _actions = new List<Action<SomeClass<T>>>();

    void Add<T>( Action<SomeClass<T>> foo )
    {
        _actions.Add( foo );
    }
}

Compiler:

The type or namespace name 'T' could not be found (are you missing a using directive or an assembly reference?)

initial code snipped class SomeClassBase { }

class SomeClass<T> : SomeClassBase
{
    public T Data { get; set; }
    // and more ....
}

class App
{
    List<Action<SomeClassBase>> _actions = new List<Action<SomeClassBase>>();

    void Add<T>( Action<SomeClass<T>> foo )
        where T : SomeClassBase
    {
        _actions.Add( foo );
    }
}

The compiler complains - for the _actions.Add() line;

Argument 1: cannot convert from 'System.Action<test.SomeClass<T>>' to 'System.Action<test.SomeClassBase>'
The best overloaded method match for 'System.Collections.Generic.List<System.Action<test.SomeClassBase>>.Add(System.Action<test.SomeClassBase>)' has some invalid arguments

From the application side there is no need for the SomeClassBase class, yet it seems impossible to define a List of Action<SomeClass<T>> elements and the approach with the base-class works when using the class in the List, instead of the Action

Thanks, jochen