The EM_HIDESELECTION message hides or shows the selection in a rich edit control.
EM_HIDESELECTION
wParam = (WPARAM) (BOOL) fHide;
lParam = (LPARAM) (BOOL) fChangeStyle;
If this parameter is nonzero and the control has the focus, the selection is hidden or shown as appropriate.
No return value.
Windows NT: Requires version 3.51 or later.
Windows: Requires Windows 95 or later.
Windows CE: Unsupported.
Header: Declared in richedit.h.
Rich Edit Controls Overview, Rich Edit Messages