wpf - Click Event not working anymore when using Helixtoolkit.SortingVisual3D -

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i want add transparency objects (without loosing click-event). google told me try sortingvisual3d. without sortingvisual3d (except transparency) worked well, click-events also.

now tried implement (simplified code):

public sv3d new helixtoolkit.wpf.sortingvisual3d public model3dui new modeluielement3d  'apply geometry     model3dui.model = geometry 'skipped geometry code in post 'add click event     addhandler model3dui.mouseleftbuttonup, addressof clickevent 'add sortingvisual3d     sv3d.children.add(model3dui) 'add viewport     viewport.children.add(sv3d) 'setup sortingvisual3d     sv3d.sortingfrequency = 2     sv3d.method = helixtoolkit.wpf.sortingmethod.boundingboxcorners     sv3d.issorting = true

basically works fine, renders should , transparency working too. reason click event doesn't work. has idea i'm doing wrong?

i'm not experienced helixtoolkit, way wrong.


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