Maintaining function texts dynamically for push button in se41

Hai experts

I need to give the function text 30 character text in my application toolbar push butttons.

here i am able to give maximum 20 characters.

There is a option for menu bar buttons texts.

But i need for function texts for push button on application toolbar.

Ex:say Download push button.

i need to give text like "Downloading purchase order details"

Thanks.

Sailaja