WM_FOCUSCHANGE (in Frame Controls) - Remarks

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.