[IMP](Axis Grid Lines) It is now possible to draw grids when the corresponding axis is not visible.
[IMP](axis labelSpacingMin) The labels' bounding boxes now better model the effective height of text; thus, now, the algorithms for label hiding and automatic tick count calculation work better; it was now possible to slightly increase the default labelSpacingMin for discrete axes, from 0.1 to 0.25.
[FIX](BasePanel MultiChart) The "data" property always had the value of the root chart, and not of the chart to which the panel belongs