Problem when Working With Combo

Dear all,
I am having a problem when i am working with Combobox.At the time of modification of any existing record i am retrieving the value and description of a Combo and doing accordingly.But sometimes it is showing error that Object Reference is not set.
If i click that combo(one time) then i am not getting any of error.
Error comming from the line like : strDesac=oCombobox.Selected.Description
The thing is that this is not selected item ,it it comming automatically.
How to handle this types of error.
Waiting for as reply soon.
Regards
Sanjay

But, this is the question! I dont know how to initialize the combobox' first option. Help me, please! I am using the addItem method as follow:
MakeJCombo ( JComboBox ComboObj) {
ComboObj.addItem ("option1");
ComboObj.addItem ("option2");
ComboObj.addItem ("option3");
then:
public void itemStateChange(ItemEvent ie) ...
Object origem = ie.getSource()...
if (origem == ComboObj) ...

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