The frame control responds to this message by sending the other messages depending on the value of the fsFocusChange parameter. These messages, if sent, are sent in the following order:

• WM_SETFOCUS to the window losing the focus.
  
• WM_SETSELECTION to the windows losing their selection.
  
• WM_ACTIVATE to the windows being deactivated.
  
• WM_ACTIVATE to the windows being activated.
  
• WM_SETSELECTION to the windows being selected.
  
• WM_SETFOCUS to the window receiving the focus.