am trying to create class to encapsulate toolbar but the background turns black. c++ win32api

I created a simple class to hide the details of creating a toolbar in win32 API but I don't like the toolbars it is producing. (See image for clarification. I don't have reputation points so I have just posted a link)

http://i35.tinypic.com/1zmfeip.jpg

I have no idea now the black background is coming into my application.

Here is the class declaration in file CToolBar.h

#ifndef _CTOOLBAR_H
#define _CTOOLBAR_H

#include<windows.h>
#include<commctrl.h>

class CToolBar
{
public:
       CToolBar();//constructor
       ~CToolBar();//destructor

       void AddButton(int iconID, int command);//add Both a button, its icon and its command ID
       void Show();//display the toolbar
       void Initialise(HINSTANCE hInst, HWND hParent);
protected:
          HINSTANCE m_hInst;
          HWND m_hParent;
          HWND m_hToolBar;
          HIMAGELIST m_hImageList;
          TBBUTTON m_Tbb[4];  //toolbar buttons
          int m_numberButtons;     
};
#endif

here is the implementation in file CToolBar.cpp

//CToolBar.cpp
#include "CToolBar.h"
#include<windows.h>
#include<commctrl.h>

CToolBar::CToolBar()//the constructor
{
    m_hImageList=ImageList_Create(32, 32, ILC_COLOR32, 0, 15);//returns NULL if the function fails
   //finish other initialisations
   InitCommonControls();//initialise commctrl.dll whatever.. or else your toolbar wont appear
  }

void CToolBar::Initialise(HINSTANCE hInst, HWND hParent)
{
  m_hInst=hInst;
  m_hParent=hParent; 

  m_hToolBar=CreateWindowEx(
                WS_EX_PALETTEWINDOW ,
                TOOLB开发者_如何学GoARCLASSNAME,
                "",
                WS_CHILD | WS_CLIPCHILDREN | WS_CLIPSIBLINGS |WS_VISIBLE|TBSTYLE_BUTTON | TBSTYLE_TOOLTIPS | CCS_ADJUSTABLE | CCS_TOP ,
                0, 0,
                0, 0,
                m_hParent,
       NULL,
                m_hInst,
                0);
}

CToolBar::~CToolBar()//destructor
{
 ImageList_Destroy(m_hImageList);
}

void CToolBar::AddButton(int iconID, int command)
{
     HICON hIcon = LoadIcon(m_hInst, MAKEINTRESOURCE(iconID));
     ImageList_AddIcon(m_hImageList, hIcon);
     DeleteObject(hIcon); 

if(iconID!= -1)//-1 means the separator. The rest are mere buttons
{     
     m_Tbb[m_numberButtons].iBitmap =m_numberButtons;
     m_Tbb[m_numberButtons].idCommand = command;
     m_Tbb[m_numberButtons].fsState = TBSTATE_ENABLED;
     m_Tbb[m_numberButtons].fsStyle = TBSTYLE_BUTTON; 
     m_Tbb[m_numberButtons].dwData = 0; 
     m_Tbb[m_numberButtons].iString = 0;
}
else//ie if (iconID== -1) ; then display the separator. the command value is ignored
{
     m_Tbb[m_numberButtons].iBitmap =-1;
     m_Tbb[m_numberButtons].idCommand = 0;
     m_Tbb[m_numberButtons].fsState = TBSTATE_ENABLED;
     m_Tbb[m_numberButtons].fsStyle = TBSTYLE_SEP; 
     m_Tbb[m_numberButtons].dwData = 0; 
     m_Tbb[m_numberButtons].iString = 0;

}     

     m_numberButtons++;

}

void CToolBar::Show()
{  
SendMessage(m_hToolBar, TB_SETIMAGELIST , (WPARAM)0, (LPARAM)m_hImageList);
SendMessage(m_hToolBar, TB_BUTTONSTRUCTSIZE, sizeof(TBBUTTON), 0);//message for backward 
//compatibility
SendMessage(m_hToolBar, TB_ADDBUTTONS, m_numberButtons, (LPARAM)m_Tbb);   
SendMessage(m_hToolBar,WM_SIZE,0,0);

ShowWindow(m_hToolBar, SW_SHOW);
}

How i used the class

in main.cpp, i created a global instance of the class.

CToolBar myToolBar; 

in the callback procedure, under WM_CREATE, I used some member functions.

case WM_CREATE:
     myToolBar.Initialise(g_hInst,hwnd);
     myToolBar.AddButton(IDI_OPEN, ID_OPEN);
     myToolBar.AddButton(IDI_MAIN,ID_OPEN);//Separator button
     myToolBar.AddButton(IDI_CLOSE, ID_CLOSE);
     myToolBar.AddButton(IDI_CLOSEALL, ID_CLOSE);
     myToolBar.Show();
     break;

That's about it.

Try modifying the flags parameter of ImageList_Create to include ILC_MASK as well

Looks like you are using bitmap with transparency channel. GDI does not support alpha channel. It uses special color which will be transparent. If you want to support 32-bit bitmaps you could use GDI+ for drawing such bitmaps. Another option is to use CAplhaToolbar which already supports bitmaps with alpha transparency.