Hi John.

Once I call new() (appen blank), the value of my combobox reset. How to bind data without reset the value of combobox to ""? Also, the list in combo is defined by user.

What you need to do is to save the value of the property that is the ControlSource for the comboBox before you call New(). Then, after the call to New(), you have to set the property in your bizobj that the combo is bound to to the value that you saved before you called New(). Finally, refresh the combo.