How to disable UIToolbar flexible space item clicks - iphone

I have a UIToolBar with some button items on it separated by a flexible space item.
Depending on the state of the app, some buttons are enabled or disabled. And when this happens, when the disabled button is clicked, instead of doing nothing, it sends the "click" event to other button item.
I then understood that this is a default behavior for the toolbar (or the flexible space item?): when you touch an empty space on it, it forwards the event to the closest button. However this is not very good for usability in my application.
Setting enabled OFF to the flexible space item does not change anything at all, and removing UserInteraction from the whole toolbar will make all buttons untouchable.
Is there any way to prevent this "click event forwarding" and simply ignore the touches on empty spaces or disabled buttons ?
Thanks in advance

Well for anyone who wants to know, i couldn't do anything to solve it, you'd better do a better work with your ui.

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I am having download icon on my page i want that when the user takes his finger over the button a tooltip should show as showing download in text.
is there any option in iphone to show a tooltip???
Dan is absolutely right on how to do it but I'd answer you should rethink your design to not need the tooltip at all.
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You should rethink your design to make it obvious what the buttons do without the user having to interact with them first.
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Hope it helps.
https://github.com/akeara/AKETooltip