Vanishing Grid Lines

[Chellappan_Palaniappan]

I am using Xojo 2026 Release 1 on Mac OS Tahoe

I have a listbox in the first tab of a Tab Panel control.

The grid lines of the listbox are visible when the window opens.

If I view the second tab and then come back to the first tab, the grid lines are missing.

Any help ?

[Eric_Williams]

You’re not alone:

My ListBoxes have Lost Their Horizontal Lines Under MacOS

After updating from Ventura to Sequoia, many (but not all!) of my apps’ ListBoxes no longer display their horizontal lines, which I typically set to “Thin Dotted”. Under Windows, they all look normal. Xojo 20221r2.1. Anyone else seen this issue?

[Michael_Hußmann]

It looks like grid lines under macOS are gone now, i.e. either dead or dying. They still show up in the documentation but in my experience one can no longer make any selection of grid line styles.