Hi Tom,

you could do that by using the customization facilities, like this:

public class WordLength : VSCustomizableNumBase<ushort>
{
  protected override Int32 GetInt32()
  {
    return Convert.ToInt32(this.value * 2);
  }
  protected override void SetInt32(Int32 value)
  {
    this.value = (ushort)(value / 2);
  }
}

[VSSerializableContainer]
public class MyContainer
{
  [VSSerializableBinary(100, CounterMode = VSCounterMode.BytesStored, CounterMemberSpan = int.MaxValue)]
  private WordLength dgLen = new WordLength();

  [VSSerializableBinary(200)]
  private int someData;

  [VSSerializableBinary(300)]
  private int someMoreData;

}