How do I use a FindControl method inside a Web User Control?

Hi Experts,

I have a subroutine that finds a web control, then sets its value. (Please see attached code snippet)  

However, the FindControl cannot find the control if I put it on a user control, which I then include on a page.  

If I put this subroutine inside the page, instead of the user control, the subroutine works.

How do I find controls in a page from inside a user control?

Thanks,
Paolo

Public Sub Set_Form_Field(ByVal in_ControlID, ByVal in_Value)
        'sets the value of the form field regardless of web control type. 
        If Not IsNothing(FindControl(in_ControlID)) Then
            Dim ctrl As Control
            ctrl = FindControl(in_ControlID)
            
            'textbox
            If TypeOf ctrl Is TextBox Then
                Dim txt As TextBox
                txt = CType(ctrl, TextBox)
                txt.Text = in_Value
            End If
         
            'hiddenfield
            If TypeOf ctrl Is HiddenField Then
                Dim hdn As HiddenField
                hdn = CType(ctrl, HiddenField)
                hdn.Value = in_Value
            End If
         
            'listbox
            If TypeOf ctrl Is ListBox Then
                Dim cmb As ListBox
                cmb = CType(ctrl, ListBox)
                cmb.SelectedValue = in_Value
            End If
         
            'label
            If TypeOf ctrl Is Label Then
                Dim lbl As Label
                lbl = CType(ctrl, Label)
                lbl.Text = in_Value
            End If
    
            'checkbox
            If TypeOf ctrl Is CheckBox Then
                Dim chk As CheckBox
                If in_Value = "True" Then
                    chk = CType(ctrl, CheckBox)
                    chk.Checked = True
                End If
            End If
        End If
        
    End Sub

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