FindControl Returns a Null Reference

Question

I have two textboxes and I use FindControl() to access them:

<tr>
        <td align="right">
            <asp:Label ID="LastNameLabel" AssociatedControlID="LastName" runat="server" /></td>
        <td>
            <asp:TextBox ID="LastName" runat="server"></asp:TextBox>
            <asp:RequiredFieldValidator ID="LastNameRequired" runat="server" ControlToValidate="LastName" Display="Dynamic"></asp:RequiredFieldValidator></td>
    </tr>
    <tr>
        <td align="right">
            <asp:Label ID="PrimaryCompanyLabel" AssociatedControlID="PrimaryCompany" runat="server" /></td>
        <td>
            <asp:TextBox ID="PrimaryCompany" runat="server"></asp:TextBox>
            <asp:RequiredFieldValidator ID="PrimaryCompanyRequired" runat="server" ControlToValidate="PrimaryCompany" Display="Dynamic"></asp:RequiredFieldValidator></td>
    </tr>

The Textbox LastName is being accessed fine but the second, PrimaryCompany is returning a null reference

They are being access by:

private IEditableTextControl _txtLastName;
    protected IEditableTextControl txtLastName
    {
        get
        {
            if (_txtLastName == null)
            {
                _txtLastName = (IEditableTextControl)this.CreateUserStep.ContentTemplateContainer.FindControl("LastName");
            }
            return _txtLastName;
        }
    }

private IEditableTextControl _txtPrimaryCompany;
    protected IEditableTextControl txtPrimaryCompany
    {
        get
        {
            if (_txtPrimaryCompany == null)
            {
                _txtPrimaryCompany = (IEditableTextControl)this.CompleteStep.ContentTemplateContainer.FindControl("PrimaryCompany");
            }

            return _txtPrimaryCompany;
        }
    }

This code is from the SharePoint2013 FBAPack in CodePlex. The LastName field is built-in while the PrimaryCompany field is being added by me.

I'm only showing this part of the code as the null reference is being thrown here. Am I missing something?

Answer 1

For some reason IEditableTextControl doesn't work on the field that I created. I used TextBox instead and it worked.