no text on button in pcui

Hi,

I want to add one button in search result area, in pcui(portal).

I created zevent ,and i provided the text to it,

and it is functionality relevent.

I added this event in my tool bar.

Iam able to see the button(empty button no text is displayed(name of button)).But there is no text on button.Why?.

2.)If i press this button, i should get one pop window.

with some text.Please tell me the procedure, step by step.How to implement this button.

Thanks