<div class="box box-primary">
<div class="box-header with-border">
    <h3 class="box-title">
        <asp:Literal ID="litTitulo" runat="server"></asp:Literal>
    </h3>
    <div class="box-tools pull-right">
        <button data-widget="collapse" class="btn btn-box-tool"><i class="fa fa-minus"></i></button>
    </div>
</div>
<!-- /.box-header -->
<div class="box-body">
    <asp:PlaceHolder ID="PlaceHolder1" runat="server">
    </asp:PlaceHolder>
</div>

Imports System.ComponentModel

<TemplateContainer(GetType(MyTemplateContainer))> _
<TemplateInstance(TemplateInstance.Single)> _
<PersistenceMode(PersistenceMode.InnerProperty)> _
<Browsable(True)> _
<DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)> _
Public Property ContentTemplate() As ITemplate
    Get
        Return m_ContentTemplate
    End Get
    Set(value As ITemplate)
        m_ContentTemplate = value
    End Set
End Property
Private m_ContentTemplate As ITemplate

Private m_titulo As String
Public Property TituloBox As String
    Get
        Return m_titulo
    End Get
    Set(value As String)
        m_titulo = value
    End Set
End Property


Protected Sub Page_Load(sender As Object, e As EventArgs)

End Sub
Protected Sub Page_Init(sender As Object, e As EventArgs)
    Me.PlaceHolder1.Controls.Clear()
End Sub
Protected Overrides Sub CreateChildControls()

     If Me.ContentTemplate IsNot Nothing Then
        Dim container = New MyTemplateContainer()
        litTitulo.Text = m_titulo
        Me.ContentTemplate.InstantiateIn(container)
        Me.PlaceHolder1.Controls.Add(container)
    Else
        Me.PlaceHolder1.Controls.Add(New LiteralControl("No hay contenido"))
    End If
End Sub
Public Overrides Sub DataBind()
    Me.CreateChildControls()
    Me.ChildControlsCreated = True
    MyBase.DataBind()
End Sub

<asp:FormView ID="fvEmpresa" runat="server" RenderOuterTable="false">
        <EmptyDataTemplate>
            <p>NO HAY DATOS</p>
        </EmptyDataTemplate>
        <EditItemTemplate>
        <div class="row">
                <uc1:UCBSBoxPrimary runat="server" ID="mybox1" TituloBox="Titulollo">
                <ContentTemplate>
                    <p>Contenido</p>
                </ContentTemplate>
                </uc1:UCBSBoxPrimary>
        </div>
        </EditItemTemplate>

        </asp:FormView>

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
'cargar el templatedcontrol
    Dim mybox As UCBSBoxPrimary = CType(CUtilLocal.FindControlByID(fvEmpresa, "mybox1"), UCBSBoxPrimary)
    If (Not IsNothing(mybox)) Then
        mybox.TituloBox = "titulillo"
    End If
End Sub