Add images to the PtTree widget's image list
int PtTreeAddImages( PtWidget_t *widget, PhImage_t const *images, int n );
This function adds n images to the widget's image list. The function returns the index of the first of the added items, which is the same as the number of images on the list (before the new ones were added). The widget makes its own copy of the PhImage_t structures, but it doesn't copy the palettes or image data pointed to by members of the structures.
The index of the first of the added items.
See “Using images in tree items” in the description of PtTree.
PhImage_t in the Photon Library Reference