MOVING app from VB.net to Expression

Hi all,
I start porting one my app to Expression from VB.net because Expression i designer friendly...and i have some problems.

1) When i use AppendText for adding text to RTB, my links not underlined and i cant click on that (I enable option IsDocumentEnabled)

2) How i can replace ":D" with an smiley from RESOURCE in RTB. I used Clipboard method combined with RegEx in VB.net, but now i cant get it to work with WPF

3) How i can make my Listbox to keep selection after removing an item ???



Thanks in advice

Anybody please ???

New problems:
1. Can i make tabel in WPF with LABELS i mean, can one LABEL be one ROW in TABEL but just separated in grids ???
Now i using 50 labels for tabel and that really SLOVING DOWN my Expression Studio.