C / C++ / MFC

CString strClipboardText = ...;

if (!OpenClipboard() || !EmptyClipboard())
{
	AfxMessageBox("Error: can't open the clipboard.");
	return;
}
HGLOBAL hglbText = GlobalAlloc(GMEM_MOVEABLE, 1 + strClipboardText.GetLength()); 
char *pData = (char *)GlobalLock(hglbText); 
lstrcpy(pData, strClipboardText);
GlobalUnlock(hglbText); 
SetClipboardData(CF_TEXT, hglbText);
CloseClipboard();

Create(CWnd* pParent, DWORD nStyle)
{
  //Extract the bits your interested in using bitwise AND's
  //(i think) and basically do what you want to/with them before 
  //sending the rest to default Create.
  CWnd::Create(nSytle...blah);
}

#define CWS_3DBORDER  0x01  //First bit of DWORD style is now used by child window style (CWS)

//Create custom control window with custom style
m_wndChild.Create(this, WS_CHILD | WS_VISIBLE | CWS_3DBORDER);

//Custom control overloaded Create function
CCustom::Create(CWnd* pParent, DWORD nStyle)
{
  m_b3DBorder = nStyle & MASK;
}

//CCustom control OnPaint handler
CCustom::OnPaint()
{
  CPaintDC dc(this);
  if(m_b3DBorder)
    //Draw 3d border cuz it was specified in style flag

  //Continue with normal drawing code
}