JavaFX 2.0 :: ComboBox Caret Position

I am developing a form with ComboBox as a subject (the user can choose one from the list , or type one) and TextArea where the user can write his notes (attached a picture). The user using a virtual keyboard (touch) to enter any characters.
 
I am using the append method to append the next Char to the TextInputControl class (both Combo and TextArea Inherit from it). When I try to deletePreviousChar() in the TextArea it works, but in ComboBox it fails

I put some System.out.println() to see what is the problem and it seems that with the ComboBox the class is loosing the Caret position after every action
 
Here is my code: (Look it also as a attached picture)

public void changed(ObservableValue<? extends String> observable,
  String oldVal, String newVal) {
  if (newVal != null) {
  if (lastNodeInFocus instanceof TextArea) {
  switch (newVal) {

[Code] ....
 
Here is the Debug results:  CB = Combo  TA = TextArea  B=Before  A=After , the numbers are the caret position (also attached as a picture )

CB - append B 0
CB - append A :1
CB - append B 0
CB - append A :2
CB - append B 0

[Code] ....
 
combo caret code.png
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combo caret debug results .png
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my form.png
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