setlength(aryButtons,thislength);
for i:=0 to length(aryButtons)-1 do
 begin
 aryButtons[i]:=TSpeedButton.Create(self);
 aryButtons[i].Parent:=Panel1;
 aryButtons[i].Visible:=true;
 end;怎样把相应事件赋予aryButtons[i]并知道是哪个button触发的数组呢?