Issue with jquery ui Dialog Modal

Issue with jquery ui Dialog Modal

Hi, I have a form with radio , checkboxes and buttons form fields. Then I invoke a Modal window, It is showed perfectly, but If I Mouse over or navegate over tabs, The form elements of the "opener" appears over the modal "child" overlay.

I ve modified z-index property, but nothing.

See the print screen :

http://sia1.subirimagenes.net/img/2014/01/27/140127112543813724.jpg


Im using  jQuery UI CSS Framework 1.8.18 .

Thanks for any help !