about CToolBar::AddButton in the win7

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C++

Windows

Win7

i have a ocx with vc6,and no error when run this ocx in windows2003 and winXp ,now i want to run in win7,and i find some wrong when test this ocx in TSTCON32.EXE , and i found the error where i run to AddButtons. the error dlg is shown with the words like "Unhandle exception in TSTCON32.EXE（kernel32.dll) 0xC0000005 Access Violation". someone can help me? many thanks.

and the flowwing is the code :

CToolBar m_ToolBar;
CToolBarCtrl  objToolBarCtrl = m_ToolBar.GetToolBarCtrl();
TBBUTTON objButton;
 
objButton.idCommand = IDB_ANSWER;
objButton.iBitmap = 0;
objButton.fsStyle = TBSTYLE_BUTTON;
objButton.fsState = TBSTATE_ENABLED;
 
objToolBarCtrl.AddButtons(1, &objButton);