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TAdvDBComboBox
Programmatically adding items

To add values to a TAdvDBComboBox programmatically, by far the easiest solution is to use the method AdvDBComboBox.AddDisplayAndStoredValue. Example: 
  AdvDBComboBox1.AddDisplayAndStoredValue('<1000','0');
  AdvDBComboBox1.AddDisplayAndStoredValue('>1000 and <10000 ','1');
  AdvDBComboBox1.AddDisplayAndStoredValue('>10000 and <50000 ','2');
  AdvDBComboBox1.AddDisplayAndStoredValue('>50000 and <100000 ','3');
  AdvDBComboBox1.AddDisplayAndStoredValue('>100000 and <500000 ','4');
  AdvDBComboBox1.AddDisplayAndStoredValue('>500000 and <1000000 ','5');
  AdvDBComboBox1.AddDisplayAndStoredValue('>1000000','6');

Where the first value is what will be displayed in TAdvDBComboBox and the 2nd value what will be stored in the DB field.

To clear items programmatically, you can use: 
AdvDBComboBox.Items.Clear;