I needed to come up with a way to recenter any and all windows that are on screen when a user resizes their browser. does anyone see any issue with the following approach (which appears to be working well).

Code:
window.onresize = function(){
    var w = Ext.query('.x-window');
    Ext.each(w, function(item){
        Ext.getCmp(item.id).center();
    })
}