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Tooltips from my TooltipModifier were being clipped at the SciChartSurface’s boundaries when they were long, which I didn’t like. I poked around a bit and discovered SciChartSurface.ClipModifierSurface. After setting this to false, the tooltips were allowed to spill over the boundaries as desired. Yay! However, certain elements including (but perhaps not limited to) the GridLinesPanel’s border lines and gridlines from adjacent plots end up rendering on top of the tooltip (see screenshot; it’s showing two surfaces stacked vertically, with a tooltip from the top one spilling over onto the one below it). Is there anything I can do to prevent this? Things that didn’t work were using a custom TooltipContainerStyle with the new container’s opacity set to 1.0 and its Panel.ZIndex to 100.