How to create check box on new dialog

[freedomtoome]

why check box not created on new dialog
for all help me , thank you very much

my code

void CProjecttestDlg::OnLoaddialogbutton()
{
CNewdialog *newDialog;
newDialog = new CNewdialog;

CButton *myCheck;
myCheck = new CButton;

myCheck->Create(_T("dog") , WS_VISIBLE|BS_AUTOCHECKBOX , CRect(10 , 30 , 100 , 70) ,newDialog ,800);

newDialog->DoModal();
}