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while Pnl3.Componentcount >0 do
begin
if pnl3.Components[0] is TSpeedButton then
FreeAndNil(pnl3.Components[0])
//或者 RemoveComponent(pnl3.Components[0])
end;
for i:=Pnl3.Componentcount-1 downto 0 do
begin
if pnl3.Components[i] is TSpeedButton then
RemoveComponent(pnl3.Components[i]);
end;