Problem about multiple combobox search

Hi,
i am using mvd v1.49

i have 2 combobox list names of person

i want to filter result in combo box so i used example on this url
http://myvisualdatabase.com/forum/misc. … download=1

problme is: i filtered combobox1 and select person name
when i click on combobox2 to filter combobox1 selected person become empty

i tried it on latest version of mvd it works fine.
i think theremust be a bug on my version

is it possible to fix it?