Hi,

You can use the following code:

final Button btnClickMe = new Button("Click Me");
btnClickMe.setStyleName(BaseTheme.BUTTON_LINK);
btnClickMe.addClickListener(new ClickListener() {
            @Override
            public void buttonClick(final ClickEvent event) {
               //Your code here

            }
        });

The function:

btnClickMe.setStyleName(BaseTheme.BUTTON_LINK);

is used to make a button look like as link.

Thanks