[TCArknight]

If I recall, it’s a matter of changing some definitions in the UI components.

Here's an example:
File: styles_ui.aug

  <!-- bitmap for use as the background of label portals designated as a "title" -->
  <resource
    id="titleback"
    isbuiltin="yes">
    <bitmap
      bitmap="mainwindow.bmp">
      </bitmap>
    </resource>

With it being builtin="yes", that has the program looking at the /builtin folder under the Hero Lab folder (mine is C:\Program Files (x86)\Hero Lab\product\builtin )

Changing the above code to:

  <resource
    id="titleback"
    issystem="no"
    isbuiltin="no">
    <bitmap
      bitmap="panel_title.bmp">
      </bitmap>
    </resource>

put the panel_title.bmp in the dataset folder. This is the folder that is checked for the bmp file when the issystem="no" and the builtin="no" entries

next time you restart the titles of your panels will now be purple.

when saving the bmp files, make sure to not save color space information with it.