BtnClearFormula.Caption:= ' 修'#13'改'#13'风'#13'格'#13''#13''; //中文支持不够好,需要增加空格.
setwindowlong(self.BtnClearFormula.Handle, gwl_style, getwindowlong(self.BtnClearFormula.Handle,gwl_style) or bs_multiline);