JSF dropdown components problem

[matara]

I have two dropdown components. I need to set values in several other components depending on the values selected in two dropdowns. When a value is selected in the first dropdown, the second dropdown is populated and upon selecting a value in the second dropdown the values in the other conponents should be changed. But, when there is only one value in a dropdown change event does not occur. How can I solve this problem please?

Than you.