>what is the way for add controls like commandbutton in a form in runtime?

Francisco,
It's very easy:

CButton myButton1;
// Create a push button.
myButton1.Create(_T("My button"), WS_CHILD|WS_VISIBLE|BS_PUSHBUTTON,
CRect(10,10,100,30), pParentWnd, 1);

Another way is to make some controls on dialog invisible initially (without WS_VISIBLE style), and show them later:

myButton.ShowWindow(SW_SHOW);