First of all: that’s my app (Light Blue) that you posted a screenshot of, so I can say with a certain amount of authority that everything you see in there is pure Xojo (well, Real Studio, but near enough ).
As Norman suggests, both of the two left columns are ListBox controls.
@shao sean Can you add an example project with it?
Sure can
Done
Looks like there is an issue when the total height of your rows exceeds the limit of the scrollbar’s maximum value (int32) so will be looking in to a workaround for it (don’t want to have to make fake scrollbars like the IDE)