UnitConverter action problems

I have three ComboBoxes o开发者_开发问答n my form. What is the event so that if an item in Combobox1 is selected, the options in ComboBox2 and ComboBox3 change.

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I think you want the OnChange event, when that occurs you can modify the other comboboxes as needed.

I dont really have a good answer for your other question, sorry.