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EXTJS - How to raise and handle errors

/* handle errors that are thrown not using Ext.raise() */

window.onerror = function(msg, url, lineNumber) {

    console.warn('%s\rurl: %s\rline: %d', msg, url, lineNumber);

    return true; //true means don't propogate the error
}

Ext.application({
 
    errorHandler:function(err){
        console.warn(err);
        return true;
    },
 
    launch: function() {

        Ext.Error.notify = false; /* prevent ie6 and ie7 popup */

        /* handle errors raised by Ext.Error.raise() */
        Ext.Error.handle = this.errorHandler;    

        Ext.Error.raise('your children well');

        //throw 'man from the train';
    }
});

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