NullPointerException in Command

hi

I have a weird situation, which I'll try to explain.

mMyClass.setMyListener(new Command()
{
public void execute()
{
RootPanel mainPanel = RootPanel.get(ID);
mainPanel.add(mMyClass);

}

});

when execute() is call from MyClass, I am getting
NullPointerException. I started using GWT logging and discovered that
mainPanel.add(mMyClass); mMyClass is null at this point.:/ Something
impossible..

I don't know, if I provided enough information or not, but maybe you
will have some guesses.

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