Running your sample, I noticed that for the Grid Layout, the divider only renders after first column and after each row. The second column is not painted. It looks like it did because of the background of the tab. If the color of the divider were changed to something like red(#ff0000), it would be clear that the rendering wasn't complete.
Running your sample, I noticed that for the Grid Layout, the divider only renders after first column and after each row. The second column is not painted. It looks like it did because of the background of the tab. If the color of the divider were changed to something like red(#ff0000), it would be clear that the rendering wasn't complete.