Prevent MessageBox from closing - extjs

Question

I have a MessageBox configured like that
Ext.MessageBox.show({
buttons:Ext.MessageBox.OKCANCEL,
prompt:true,
buttonText:{ok:"Button1",cancel:"Button2"},
fn:function(btn, text, cBoxes){
if(btn=='ok'){
// do not close
// return false does not help
}
}
});
I do not know how to prevent it from closing on button click. In particular, I do not want to make it close when the user hits "ok" button. I've seen overrides on the Web, but do not know how to poperly configure buttons properties. I guess, there should be a very simple solution for this task.

Answer 1

You should use a regular window over which you'll have full control.
In your case, that would be something like this:
Ext.widget('window', {
autoShow: true
,closable: false
,modal: true
,title: "My window"
,defaults: {
margin: 5
}
// you can obviously compose the items you want; an input field
// is what you get with the prompt window
,items: [{
xtype: 'textfield'
,itemId: 'inputField'
}]
,buttons: [{
text: "Button1"
,handler: function(button) {
// here's how to get a ref to the window (for closing)
var win = button.up('window'),
// here's the value of the field
input = win.down('#inputField').getValue();
// you can close the window if you want, or not
if (!Ext.isEmpty(input)) {
win.close();
}
}
},{
text: "Button2"
,handler: function() {
// ...
}
}]
});