Hi Easen,
This cannot be done with a selection tree. The selection tree is entirely controlled by Windows Installer and you cannot hide the features that are not selected.
A workaround would be to add another control (for example a listbox) through which you can print a list with the features selected for installation. To do this first take a look
over
this tutorial that explains how to populate listboxes and comboboces.
What you need do is to create multiple "SetProperty" custom actions in the InitEvents tab from the VerifyReadyDlg through which you insert in the property
AI_LISTBOX_DATA the name of each feature, one by one. Each event will be using as a condition the feature state, you can select it easily from our "Edit Condition" dialog.
At the end you will need to call the custom action "PopulateListBox" which will parse the value of the property set previously and display in the listbox.
Regards,
Bogdan