FreeTextBox

To get "ż" I need a "right alt" + "z" (alt^z) combination.

(culture: pl-PL, keyboard: Polish(programmers))

Everything is ok until user put "left alt" + "z" combination. Then "right alt" + "z" is recognized as "back" shortcut keys not a "ż". 

What can I do with this? Where/How I can disable this shortcut?

I use  3.2.2 FreeTextBox.

On control where I write-down this bug doesn’t exits.

So, Somebody must have solution for My problem.  

Sorry for My english.

Regards.

 I have disabled this lines and it work. (line 242 in  FTB-FreTextBox.js)

241    // check for undo && redo
242    /*if (ev.ctrlKey && ev.keyCode == FTB_KEY_Z) {
243    this.Undo();
244    this.CancelEvent(ev);   
245   } else*/ if (ev.ctrlKey && ev.keyCode == FTB_KEY_Y) {