Hello，There are the following questions that need to be asked In the FourPaneViewer example:
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Why does the crosshair disappear when the user changes the blend mode? What is the reason? Under normal circumstances, whether the user changes thickMode or blendMode, the crosshair should be retained?
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The ResliceMode modification only works for the first use, why does it become invalid afterwards? It manifests itself in: the crosshair disappears when the user changes the thickMode, and the crosshair should appear when clicking ResliceMode again, but it does not.
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The crosshair disappears, how can I redraw it?