How to make a textbox?

[abdul]

I cannot create a multiline textbox on a parent window. I used the following code but it does not show any edit box on my window:

#include <windows.h>
#include "resource.h"
#define classname "myclass"
HWND winhwnd;
HWND EditBoxHwnd;
HINSTANCE hinst;
LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam)
{
	switch(msg)
	{
	case WM_CREATE:
	EditBoxHwnd = CreateWindow("EDIT", 
				"df",
                                             WS_CHILD | WS_VISIBLE
                                       |  ES_MULTILINE | ES_WANTRETURN |
                                             WS_VSCROLL,
		        CW_USEDEFAULT,
		        CW_USEDEFAULT,
		        CW_USEDEFAULT,
		        CW_USEDEFAULT,
			               hwnd,
				NULL,
				hinst,
				NULL);
		return 0;
	case WM_DESTROY:
	     PostQuitMessage(0);
	   return 0;
	}
	return DefWindowProc(hwnd, msg, wparam, lparam);
}

int WINAPI WinMain(HINSTANCE hinstance, HINSTANCE hprevinstance, LPSTR lpCmdLine, int nShowCmd)
{
	HMENU hmenu;
	WNDCLASSEX wc;
	MSG message;
	// Fills in the class structure
	wc.cbClsExtra = 0;
	wc.cbSize = sizeof(WNDCLASSEX);
	wc.cbWndExtra = 0;
	wc.hbrBackground = (HBRUSH) GetStockObject(LTGRAY_BRUSH);
	wc.hCursor = LoadCursor(NULL, IDC_ARROW);
	wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);
	wc.hIconSm = LoadIcon(NULL, IDI_APPLICATION);
	wc.hInstance = hinst;
	wc.lpfnWndProc = WndProc;
	wc.lpszClassName = classname;
	wc.style = CS_HREDRAW | CS_VREDRAW;
	wc.lpszMenuName = NULL;

	//Registers the Class

	if(!RegisterClassEx(&wc))
		{
		MessageBox(NULL, "Class failure","CLASS", MB_OK);
		return 0;
	}
	//Create thw hwnd of our main window

	winhwnd = CreateWindow( 
		classname, 
		"Welcome to my Dialog Program",
		WS_OVERLAPPEDWINDOW,
		CW_USEDEFAULT,
		CW_USEDEFAULT,
		CW_USEDEFAULT,
		CW_USEDEFAULT,
		NULL,
		NULL,
		hinstance,
		NULL);
	
	
	if(winhwnd == NULL)
	{
		MessageBox(NULL, "Hwnd failure","HWND", MB_OK);
		return 0;
	}
	ShowWindow(winhwnd, nShowCmd);
	UpdateWindow(winhwnd);

	//Messes up with the messages

	while(GetMessage(&message, NULL,0,0))
		{
		TranslateMessage(&message);
		DispatchMessage(&message);
		}

	return message.wParam;
}

Do you know why it does not show the edit box on my window?