how to load the data in combo box on a text box blur event.
for example if the user input vehicle no in text box, i want to show all the user's for that
vehicle in combobox (users details is from database).
Add a handler for the blur event and in the handler call the combo store.load. You have to write some code - there are numerous examples of how to add a handler for an event and also how to load a combo store. You have to put the 2 pieces together to solve your problem - that's what programmers do.