Various TSync in tcp events

I have a TIdCmdTCPClient receiving commands from a server, the app must do two actions with the data of these commands, show it in a listbox and post it to a memory data (cds),
The portion of showing in a listbox I perform it in TSync class, posting data not yet, I perform it in the commands OnCommand event directly,
I don't know if this is a good option or I should create another TSync class to perform it or perform it in the same TSync procedure that fills the listbox,
thnx for your help..