Message loop, CreateWindowEx, Buttons

I've been trying for the past few hours to try and find out how to handle a button click event when I create a button using CreateWindowEx.

I've managed to make it so that it detects clicks on buttons, but how can I find out what button it is? That's the bit I've been stuck on and it's becomming very annoying, and the MSDN help is useless on the subject!

Is it a standard windows button, i.e. when creating it using CreateWindowEx do you specify BUTTON as a window class?
2. Where is message loop and who is owner of your button?

Assume that it is a standard button and you want to catch the click event. Here is a copy of MSDN regarding to this:

The BN_CLICKED notification code is sent when the user clicks a button.

The parent window of the button receives the BN_CLICKED notification code through the WM_COMMAND message.

LRESULT CALLBACK WindowProc(
HWND hwnd, // handle to window
UINT uMsg, // WM_COMMAND
WPARAM wParam, // identifier of button, BN_CLICKED
LPARAM lParam // handle to button (HWND)
);
Parameters
wParam
The low-order word contains the button's control identifier.
The high-order word specifies the notification message.

lParam
Handle to the button.

It means that you should catch WM_COMMAND in the window procedure of the parent window and then either check wParam:
if (LOWORD (wParam) == IDC_BUTTON_XXX)
// This message sent by button IDC_BUTTON_XXX
else
..... Continue to check other controls.

or, if you know window handle of your button, you can check lParam:

if ((HWND) lParam == hMyButtonWnd)

The IDC_BUTTON_XXX is an integer value you use as hMenu parameter of CreateWindowEx. As written in MSDN, it should be an integer value that identifies a control (button, checkbox, etc.) being created or a handle of menu.

Hope it will help