internal override void Delete(InsertionPoint start, InsertionPoint end)
{
if (CanDelete(start, end))
{
string oldValue = ((StringClientRun)ParaBox.Source.ClientRuns[ClientRunIndex]).Contents;
int newPos = start.StringPosition;
string newValue = oldValue.Remove(newPos, end.StringPosition - newPos);
Writer(newValue);
}
}