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http://www.codeguru.com/Cpp/controls/listview/gridlines/article.php/c999/

void CMyListCtrl::OnPaint()
{
	// First let the control do its default drawing.
	const MSG *msg = GetCurrentMessage();
	DefWindowProc( msg->message, msg->wParam, msg->lParam );

	// Draw the lines only for LVS_REPORT mode
	if( (GetStyle() & LVS_TYPEMASK) == LVS_REPORT )
	{
		// Get the number of columns
		CClientDC dc(this );
		CHeaderCtrl* pHeader = (CHeaderCtrl*)GetDlgItem(0);
		int nColumnCount = pHeader->GetItemCount();

		// The bottom of the header corresponds to the top of the line 
		RECT rect;
		pHeader->GetClientRect( &rect );
		int top = rect.bottom;

		// Now get the client rect so we know the line length and
		// when to stop
		GetClientRect( &rect );

		// The border of the column is offset by the horz scroll
		int borderx = 0 - GetScrollPos( SB_HORZ );
		for( int i = 0; i < nColumnCount; i++ )
		{
			// Get the next border
			borderx += GetColumnWidth( i );

			// if next border is outside client area, break out
			if( borderx >= rect.right ) break;

			// Draw the line.
			dc.MoveTo( borderx-1, top);
			dc.LineTo( borderx-1, rect.bottom );
		}
	}

	// Do not call CListCtrl::OnPaint() for painting messages
}

To draw the vertical lines, we use the header control to determine thecolumn dimensions and also the effective client area after taking intoaccount the header control itself. Finally, we draw a line to the rightof each column.

Note that the horizontal scrollbars position is taken into account whendetermining the border. If we dont do this, we might end up with a lineright in the middle of a column when the list has been horizontally scrolled.The GetScrollPos() function returns 0 if there is no scrollbar so we dontneed to make a prior check on whether the list view control does have ahorizontal scrollbar. We could also have used GetItemRect() function, butit works only if the list has atleast one item.

The line is actually drawn one pixel left of the column border. Thisaligns it better with the column header. It also introduces a bug. Whenyou increase a column width, the column area below the last visible itemis not updated, thus leaving traces of the previous line. There are twoapproaches you can take to resolve this. First, draw the line exactly onthe column border (e.i. do not subtract 1 from borderx). The second approachis to handle the HDN_TRACK notification from the header controland invalidate the exposed area so that it gets redrawn.

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