I realise that this isn't a direct answer to your question, but it does address your underlying problem of not being able to use your 2008 component in 2014.
According to MSDN docn for SQL Server 2014 https://msdn.microsoft.com/en-us/library/cc280546(v=sql.120).aspx
You can use the current release of SQL Server Integration Services
tools to run and manage packages that include SQL Server 2008 and SQL
Server 2008 R2 SSIS custom components. We added four binding
redirection rules to the following files to help redirect the runtime
assemblies from version 10.0.0.0 (SQL Server 2008 R2) to version
11.0.0.0 (SQL Server 2014).
DTExec.exe.config
dtshost.exe.config
DTSWizard.exe.config
DTUtil.exe.config
DTExecUI.exe.config
To use SQL Server Data Tools to design packages that include SQL
Server 2008 and SQL Server 2008 R2 custom components, you need to
modify the devenv.exe.config file that is located at :\Program
Files\Microsoft Visual Studio 10.0\Common7\IDE.
To use these packages with customer applications that are built with
the runtime for SQL Server 2014, include redirection rules in the
configuration section of the *.exe.config file for the executable. The
rules redirect the runtime assemblies to version 11.0.0.0 (SQL Server
2014). For more information about assembly version redirection, see
Element for <runtime>
.
BTW there is more information on the webpage