I tried the same on a button(*add *button), its working for me,

try out this :

@UiHandler("add")
    void onAddClick(ClickEvent event) {
        //addRows();
        add.setEnabled(false);
        if(!add.isEnabled()){
            System.out.println("Hello");
            add.getElement().getStyle().setBorderColor("red");
        }
        
    }

Here add is button added using UiBinder, onClick I make it disabled and 
change the border color to red

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