This feature was delivered in HTML-Kit Tools update 20111209. To make sure that you have the latest additions, select "Help > Check for Updates" from the main menu.
You can already find as you type, using incremental search feature in HTML-Kit Tools.
This latest update makes it possible to instantly find STYLEs, IDs, JavaScript events, CLASSes and more, while skipping rest of the document. All within the familiar Ctrl+F dialog.
Sometimes it's easier to show than tell:
