Need help in progress bar

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VisualC++

Hi,
I new in vc++ programming. I have situation here where my progress bar not show movement at all.
On the dialog, i add in toolbox progress bar control call IDC_PROGRESS1 and create variable control on it too, call m_pbar1

Bool Form1::OnInitDialog()
{
.
.
m_pbar1.setpos(20); --> able to see some changing in progress bar
.
}

I add in control button OnProgram where it will create multi threading here which going to access some dll api function.

void Form1::OnProgram()
{
.
.
create thread here>>
.
}

//programming threading, return 1 for success, 0 for error
DWORD WINAPI ProgramThread(LPVOID para)
{
.
.
dll api function call >> this function will return back the program progress
.
.
.
}

//this function below will continue update the status progress program
int program_progress(value1)
{
.
.
## i try to add m_pbar1 here --> error undeclare variable
## i try alot method e.g sendDlgItemMessage(hwnd,IDC_PROGRESS1,PBM_SETPOS,value,0); but still no luck at as i don;t know how to get hwnd
return 1; //return 1 for continue programming
}

I have check other ppl solution e.g assign
HWND hwnd = (HWND)m_hWnd;
Still not working.
So,any expert here can give me some guideline or links that i can refer to..

thanks and regards,
Simon