createwindowex event handling.......

I'm using vs2008, and I've been stuck trying to use createwindowex to create a button on an external application. I have been able to successfully create the button, I just can't figure out the workings of catching the events.

I'm calling a function that returns lhWnd:

Code:

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Public Function butToTab(ByVal tabHWND As Integer)
Dim rhWnd As Integer = System.Runtime.InteropServices.Marshal.GetHINSTANCE(System.Reflection.Assembly.GetExecutingAssembly.GetModules()(0)).ToInt32()

 lhWnd = CreateWindowEx(0, "BUTTON", "test", WS_VISIBLE Or WS_CHILD, a, 1, d, e, tabHWND, 0, rhWnd, 0) ' Or SS_OWNERDRAW Or BM_CLICK
newWinT1 = lhWnd  'newWinT1 is public   
Return lhWnd
End Function

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I call the function like so:

Code:

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SendMessage(butToTab(tab1HWND), WM_CTLCOLORBTN, 0&, 0&)

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(I would like to note, even though I'm sure it's obvious, I am still new to this. I'm really just trying to get it to work, and gain somewhat of an understanding for it.)

The part I am completely confused, is finding and adding events to incoming messages only for this button. I've tried numerous times to use wndproc, and WindowProc, etc.... but I couldn't get the right messages.

For example, I have used:

Code:

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Protected Overrides Sub WndProc(ByRef m As Message)
        Select Case m.Msg

            Case WM_COMMAND
                If m.HWnd = Me.Handle Then
                    MsgBox("WM_COMMAND")
                End If
            Case BM_SETSTATE
                MsgBox("BM_SETSTATE")
            Case BM_CLICK
                MsgBox("BM_CLICK")
            Case BN_CLICKED
                MsgBox("BN_CLICKED")
        End Select
MyBase.WndProc(m)

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When I use Spy++, The button only uses BM_SETSTATE, and WM_IME_NOTIFY (I know they don't have to do really with the click itself, but its the closest thing to it).

My question is, if I just wanted that button to have a messagebox popup when I clicked it, what would I need to do? I set up the wndproc so it is constantly catching messages, but do I need to run it through another function?

I'm sorry for posting such a broad question, but I've been stuck on this for a long time, and decided I needed major help. Thanks for your replies.