I got the point. ==> You must have "Multiline" and "WantReturn" properties set on this edit box. As I observed while testing, the following is true. --> If you set just the "Multiline" then only keydown gets fired and not the keyup. --> If you set just the wantreturn and not the Multiline then only keyup gets fired and not keydown. thats it.

Habeeballah Hasnoddin

For sure you have put the messagebox code in OnKeyDown. Since the messagebox pops up in OnKeyDown, the focus is gained by the messagebox, so the OnKeyUp will not be handled on the edit box. I tested myself without the messagebox, and for me both keydown and keyup are working fine on a derived class of CEdit.

Habeeballah Hasnoddin :rose: