How to the same MouseHandler to multiple components?

I have several same components that at this stage just perform the same operation.

<g:FocusPanel ui:field="panel">
<g:FocusPanel ui:field="panel2">
<g:FocusPanel ui:field="panel3">

@UiField
FocusPanel panel, panel2, panel3;

@UiHandler("panel")
void handleClick(MouseDownEvent event) {
    //...
}
@UiHandler("panel2")
void handleClick2(MouseDownEvent event) {
    //...
}
@UiHandler("panel3")
void handleClick3(MouseDownEvent event) {
    //...
}


So far so good, but how can I "manually" add a mouse handler inside a loop like within the class constructor:
    for (FocusPanel panel : panels) {
            panel.addMouseDownHandler(new MouseDownHandler() {
                @Override
                public void onMouseDown(MouseDownEvent event) {
                    Window.alert("mouse down");
                }
            });
    }

If I write this in the constructor of the java class, I'm getting NullPointerException at this stage where the handler is added to the panel.


Is there any way that I can add these kind of mouseHandlers in the constructor? Or can elements bound via @UiField only be handlers attached via @UiHandler??

Alternativly, do you know of any workaround of adding the same MouseHandler to a bunch of objects as I'm trying in this example?

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