On the Build options left, you have a tree.
At the top, you find the project build options and just below, you have the target specific build options such as debug.
That is why I said
project and the target
Did you check both project and target build options ?
By default, the first target is selected but if you select the project (tree root), you may see the guilty wxmsw26.
If you do not find the info on IHMs, you may search in the project cbp file.
It is a simple XML file that is quite simple to understand...
Dje