C / C++ / MFC

// In a loop of "int i" enumerating TB_BUTTONCOUNT list of buttons:

// THIS WORKS, AND DELETES THE INDEXED Button
LRESULT hideResult = SendMessage(hTrayWnd, TB_DELETEBUTTON, i, 0 ); // always zero

// THE FOLLOWING CODE DOESN'T WORK, AND HIDES ANOTHER, (FAIRLY RANDOM) BUTTON,
// SOMETIMES APPEARING TO BE IN A SORT OF DISORGANIZED REVERSE-ORDER, I.E.
// IF YOU ATTEMPT TO HIDE A BUTTON TOWARDS THE FAR-LEFT OF THE NOTIFY AREA,
// IT ENDS UP HIDING A BUTTON TOWARDS THE FAR RIGHT, AS THOUGH THE INDEX OF THE ARRAY WAS REVERSED, THOUGH THIS IS NOT QUITE REPRODUCEABLE)

LRESULT hideResult = SendMessage(hTrayWnd, TB_HIDEBUTTON, i, 1 ); // 1 to hide, 0 to show

public:
	void SetBitmapDataSize(const int x, const int y);

private:
	int m_PixelNumberX;
	int m_PixelNumberY;
	vector<vector<COLORREF> > BitmapData; 

void CBitmapOp::SetBitmapDataSize(const int x, const int y)
{
	m_PixelNumberX = x;
	m_PixelNumberY = y;
	if((x>=0) && (y>=0))
	{		
		BitmapData.resize(m_PixelNumberX); 
		for(int x = 0; x < m_PixelNumberX; x++) 
			BitmapData[x].resize(m_PixelNumberY); 
	}
}

private:
	int m_PixelNumberX;
	int m_PixelNumberY;
	CArray< CArray<COLORREF, COLORREF&>, CArray<COLORREF, COLORREF&> > m_arrBitmapData;