Outlook Add-in some buttons are disabled in the main ribbon

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C#

Visual-Studio

Outlook

AddIn

I've created a custom form region for sending messages. Basically when composing a new message, replying, or forwarding you can toggle between the standard Outlook form or my custom form.

The major functionality seems to be working. My only problem now, is when you toggle to my custom form most of the buttons in the main ribbon (ie: "Attach File", "Address Book", "Spelling", etc) are disabled.

Any idea how I can access these buttons?


Edit: Code moved from own OP-Answer here.

I still can't get these buttons enabled. From everything I'm reading and seeing with Outlook's form designer (I'm developing in Visual Studio using C# btw) the problem is related to Microsoft.Office.Interop.Outlook._DocSiteControl.

This is the message body control. It has a property SuppressAttachments. I created a class that extends Window's RichTextBox and implements DocSiteControl and then set SuppressAttachments = 0 in its initialization but still no go.

public class MyTextBox : System.Windows.Forms.RichTextBox, Microsoft.Office.Interop.Outlook._DocSiteControl
{
    private sbyte _suppressAttachements;
    private sbyte _readOnly;
    public sbyte ReadOnly
    {
        get { return _readOnly; }
        set { _readOnly = value; }
    }

    public sbyte SuppressAttachments
    {
        get { return _suppressAttachements; }
        set { _suppressAttachements = value; }
    }
}