private void init()
{
arg.Clear();
for (int i = 0; i < 3; i++)
{
MathFormula f = MathFormula.FromString(MathSymbolFactory.Sizes, formulaStrings[i]);
formulas[i] = f;
f = f.FullTransform(null);
ObjectFormulaTree t = ObjectFormulaTree.CreateTree(f);
trees[i] = t;
arg.Add(t);
}
}