WordBreakFinder and FindReplaceForm

Hi,

I've overridden WordBreakFinder property populating WordContainsAdditionalCharacters collection with additional characters (such as $ and -) as since words of PowerShell language can contain them. Selection works fine in the editor: I can select the whole words such as variables or commandlets But if I try to search for the whole word using standard FindReplaceForm I fail to find variables (I suppose because of $ character).

How can I make '$' character to be considered a part of the word for FindReplaceForm?

Thanks in advance,
Alexey.