gistfile1.js

p  = new Ext.Panel({
    renderTo : document.body,
    itemId : 'mypanel',
    height : 200, 
    width  : 500,
    frame  : true
});

t = new Ext.form.field.Text({fieldLabel : 'meh'});

w = new Ext.Window({ 
    title  : 'meh', 
    border : false,
    layout : 'fit',
    plain  : true,
    items  : {
        xtype : 'form',
        items : t
    }
});

p.add(w);

w.show()

// Cannot find the textfield directly
console.log(p.query('textfield'));

// We can find the window though
console.log(p.query('window'));


// Can find if we search for window instance, then textfield
console.log(p.query('window')[0].query('textfield'));


// we can go up though:
console.log(t.up('#mypanel'));