Combobox in win32

[C++ Programming]

HI ,

I struck in below scenario. please put some light on it.
I have one combobox and edit control in win32 application.

1. i keep on updating my combobox with new data, but while doing that, previous data in combobox missing.

2. when i choose one data item in combobox corresponding value should be updated in edit box.

Thanks,
Goutham.