public HorizontalBracket(EquationContainer parent, HorizontalBracketSignType signType)
     : base(parent)
 {
     topEquation    = new RowContainer(this);
     bottomEquation = new RowContainer(this);
     bracketSign    = new HorizontalBracketSign(this, signType);
     childEquations.Add(topEquation);
     childEquations.Add(bracketSign);
     childEquations.Add(bottomEquation);
 }
 public HorizontalBracket(EquationContainer parent, HorizontalBracketSignType signType)
     : base(parent)
 {
     topEquation = new RowContainer(this);
     bottomEquation = new RowContainer(this);
     bracketSign = new HorizontalBracketSign(this, signType);
     childEquations.Add(topEquation);
     childEquations.Add(bracketSign);
     childEquations.Add(bottomEquation);
 }