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Thanks a lot for fast response

I tried that , but it is still looking like a button , that is blue hyperlink does not appear under the "Create New User" and it appear as box .

I think we need to change style , but i am not able to figure out what to change

Please help

Not only change <button for <a href="#", but also suppress ui-state-default from class list.

Thanks for reply and helping

Can you please explain more . there are different CSS file

jquery.ui.tabs ,  jquery.ui.slider , jquery.ui.selectable , jquery.ui.resizable , jquery.ui.progressbar , jquery.ui.dialog , jquery.ui.datepicker , jquery.ui.core , jquery.ui.autocomplete , jquery.ui.all , jquery.ui.accordion , jquery.ui.theme

If you please show the code where changes need to be done , it would be great help as i am new to jquery

What I advised (change <button to <a, and suppress ui-state-default class) came from directly looking at the link you cited (http://jqueryui.com/demos/dialog/#modal-form): using Firebug, you may verify that this change matches your need, at the resulting code stage.
This change concerns HTML code, not CSS contents!

In the other hand, I don't know which is your exact context of use: remember that I talked about the above link only.
I gave a general advice about HTML/CSS use, but if you're using jQuery UI components, I cannot say more, since I don't use jQuery UI, and I think you'd better posting in the jQuery UI forum.