我解决了,谢谢!
Procedure TForm1.FormKeyPress(Sender:Tobject;Var Key:Char);
Begin
if key=#13 then { 判断是按执行键}
if not (ActiveControl is TDbgrid) Then
Begin { 不是在TDbgrid控件内}
key:=#0;
perform(WM_NEXTDLGCTL,0,0);{移动到下一个控件}
end else
if (ActiveControl is TDbgrid) Then{是在 TDbgrid 控件内}
begin
With TDbgrid(ActiveControl) Do
if Selectedindex<(FieldCount-1) then
Selectedindex:=Selectedindex+1{ 移动到下一字段}
else Selectedindex:=0;
end;
End;