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delphic++buildervcl

DBLookupComboBox - How to clear the selected item?

What I tried to achieve is like setting ItemIndex to -1 as like in normal ComboBox, so that the selected item will be cleared.

There is no ItemIndex for DBLookupComboBox, and the Text property is read only. So how do I clear the selected item? Please help. Many thanks in advance.

PS: Closing and reopening the DBLookupComboBox->ListSource DataSet does not help.

Solution

  • Two ways:

    1) at runtime: DbLookupComboBox.KeyValue := null;

    2) at design-time: set the DbLookupComboBox.NullValueKey property to DEL (or whatever key you want to use to null the value during runtime)