In using AdvStringGrid
When Scrollbars = ssBoth property, if the grid does not have vertical scrolling and there is horizontal scrolling, is there a way to scroll left and right when moving the mouse wheel and scroll up and down when moving the mouse wheel when vertical scrolling is displayed?
At this moment there is not a built-in option to have the mousewheel cause horizontal scroll.
If you want this, you'd need to implement grid.OnMousWheelDown/grid.OnMousWheelUp and programmatically change the horizontal scroll position from these event handlers and set Handled = true.