Getting the Text Entered in ComboBox as the text is changed

Hi,

  I need to get the text entered in combobox when it is changed. I know that ComboBox does not have textchanged event and I tried to use the TextInput to get the new text entered in the comboxbox but it looks like the event is not getting fired. So I came across the PreviewTextInput, but the issue with this is that event takes place before updating the ComboxBox text so I am not able to get the updated text. Is there any other way to get the text changed value from combobox?

Thanks,

banu