Scroll Option for I/O field in Module Pool

Hi Leads,

I am using I/O field in Module Pool with Scrollable ( check box checked).

I gave defined length as 300 and visible length as 50.

Because if I give visible length as 300 , it looks very lengthy on the screen.

But, when I execute the transaction, I am not getting any scroll option for this field. And I am able to enter only up to 50 chars in that.

Can you please let me know how can we make I/O field as scrollable (Text Box).

Regards

Sandeep Reddy