Timer wont work

Whats wrong:

Code:

#include <windows.h> 
#include "Resource.h" 

#define ID_TIMER 1

void OnInitDialog(HWND hDlg);

BOOL CALLBACK APP_DlgProc(HWND, UINT, WPARAM, LPARAM);

int APIENTRY WinMain( 
					 HINSTANCE hInstance, HINSTANCE hPrevious, LPTSTR lpsz, int iCmd) 
{ 
	// Run main dialog  
	BOOL b = DialogBox(hInstance, "DLG_MAIN", NULL, APP_DlgProc); 
	
	return b; 
} 

BOOL CALLBACK APP_DlgProc(HWND hDlg, UINT uiMsg, WPARAM wParam, LPARAM lParam) 
{ 	
	int timer = 60;
	char timer_str[10];
	
	switch(uiMsg) 
	{ 
	case WM_INITDIALOG: 
		OnInitDialog(hDlg); 
		
		break; 
		
	case WM_COMMAND: 
		
		switch(wParam) 
		{ 
		case IDCANCEL: 
			EndDialog(hDlg, FALSE); 
			return FALSE;
			
		case IDC_START:
			SetTimer(hDlg, ID_TIMER, 1000, NULL);
			break;
			
		case IDC_STOP:
			KillTimer(hDlg, ID_TIMER);
			break;
			
		case ID_TIMER:
			itoa(timer, timer_str, 10);
			
			if(timer == 0)
			{
				KillTimer(hDlg, ID_TIMER);
			}
			else
			{
				timer--;
			}
			
			SetDlgItemText(hDlg, IDC_SECONDS, timer_str);
			
			break;
			
		} 
		break; 
	} 
	
	return FALSE;
} 

void OnInitDialog(HWND hDlg) 
{
	
}

Code:

BOOL CALLBACK APP_DlgProc(HWND hDlg, UINT uiMsg, WPARAM wParam, LPARAM lParam)
{
	static int timer = 60;
	char timer_str[10];

	switch(uiMsg){
	case WM_INITDIALOG:
		OnInitDialog(hDlg);
	break;
	case WM_CLOSE:
		EndDialog(hDlg, FALSE);
	break;

	case WM_COMMAND:
		switch(LOWORD(wParam)){
		case IDC_START:
			SetTimer(hDlg, ID_TIMER, 1000, NULL);
			break;
		case IDC_STOP:
			KillTimer(hDlg, ID_TIMER);
			break;
		}
		break;	

	case WM_TIMER:
		if(wParam != ID_TIMER) break;
		itoa(timer, timer_str, 10);

		if(timer == 0){
			KillTimer(hDlg, ID_TIMER);
		}
		else{
			timer--;
		}
		SetDlgItemText(hDlg, IDC_SECONDS, timer_str);
		break;
	}

return FALSE;
}