Class Inheritance from ASCX control - asp.net

Question

i have a problem on inheriting classes that have ASCX markup pages attached to it. See, i wrote the following ASCX markup and Codebehind:
ASCX
<%# Control Language="vb" AutoEventWireup="false" CodeBehind="HeaderBlock.ascx.vb" Inherits="CentralWeb.EMP.UI.HeaderBlock" %>
<h1>
<abbr><%= Me.Label></abbr>
<span>
<asp:Button ID="saveandreturnbutton" Text="Salvar e Voltar..." runat="server" CssClass="saveandback" />
<asp:Button ID="savebutton" Text="Salvar..." runat="server" CssClass="save" />
<asp:Button ID="return_results" Text="Voltar..." runat="server" CssClass="back" />
</span>
</h1>
Codebehind
Namespace EMP.UI
Public Class HeaderBlock
Inherits System.Web.UI.WebControls.UserControl
Protected saveandreturnbutton As Global.System.Web.UI.WebControls.Button
Protected savebutton As Global.System.Web.UI.WebControls.Button
Protected return_results As Global.System.Web.UI.WebControls.Button
Public Overridable Sub TakeAction(ByVal eventId As Integer)
'NOTHING, THIS IS THE BASE CLASS
End Sub
Private Sub saveandreturn_Click(ByVal sender As Object, ByVal e As Global.System.EventArgs) Handles saveandreturnbutton.Click
Me.TakeAction(3)
End Sub
Private Sub savebutton_Click(ByVal sender As Object, ByVal e As Global.System.EventArgs) Handles savebutton.Click
Me.TakeAction(2)
End Sub
Private Sub return_results_Click(ByVal sender As Object, ByVal e As Global.System.EventArgs) Handles return_results.Click
Me.TakeAction(1)
End Sub
End Class
End Namespace
Then, my intention is to use this base class (that have a markup), and inherit it to a non-marked up class, and refer it on a page. Like this:
Namespace EMP.UI
Public Class FrontHeader
Inherits EMP.UI.HeaderBlock
Public Overrides Sub TakeAction(ByVal I As Integer)
'CHILD CLASS ACTIONS HERE
End Sub
End Class
End Namespace
What's wrong on that test?
EDITION
After talking a litle with Tim, i'd like to do somthing like this:
<%# Control Language="vb" AutoEventWireup="false" CodeBehind="HeaderBlock.ascx.vb" Inherits="CentralWeb.EMP.UI.HeaderBlock" %>
<h1>
<abbr><%= Me.Label></abbr>
<span>
<asp:Button ID="saveandreturnbutton" Text="Salvar e Voltar..." runat="server" CssClass="saveandback" />
<asp:Button ID="savebutton" Text="Salvar..." runat="server" CssClass="save" />
<asp:Button ID="return_results" Text="Voltar..." runat="server" CssClass="back" />
</span>
</h1>
<div class="fields">
PLACE HERE CONTROLS DEPENDING ON THE PAGE WHERE THIS CLASS IS...
</div>

Answer 1

[Disclaimer: the original question had no Inherits System.Web.UI.UserControl]
You need to inherit from UserControl:
Public Class HeaderBlock
Inherits System.Web.UI.UserControl
....
But in general i would not inherit a class from a UserControl since that is a frontend control which should not contain too much business logic. If you want to "extend" it you could simply put another UserControl in it. The UserControl can contain one or multiple other controls, so a modular concept.