Plugin_help - ComboBox

hi
I am working on a plug-in to add text in LibreCAD. I want to add combobox for Horizontal and vertical alignment selection. I tried but didn't get its exact implementation method from Ascii plug-in files. Please help!!

combobox are QComboBox Class, see:
http://qt-project.org/doc/qt-4.8/qcombobox.html
for documentation