Accessing objects created at RunTime

I've created series of RichEdit on a series of tabsheets in a pagecontrol.  Everytime the user clicks on the new button, they get a new tabsheet with a new richedit on it.  To the side is a list of items that can be double-clicked with the idea being to added the item they have double-clicked on to the currently showing RichEdit.

I've got everything except how to pass the string that gets created when they double-click on the item they want to add to the currently showing RichEdit.

Any help would be greatly appreciated.