/// <summary>
/// Adds the operation to the ExpressionReader
/// </summary>
/// <param name="name">Operation name (according to the commands in the Window resources</param>
/// <param name="operation">Operation invokation expression</param>
private void AddOperation(string name, Func <IExpression> operation)
{
CalcCommand command = Resources[name] as CalcCommand;
ExpressionReader.AddOperation(command.Operation, operation, command.Priority);
}
