I’m not 100% sure what you mean by changing selection points, I’m assuming you want to change shape of resizing grips ( that semitransparent circles on the edge of annotations, that allow to resize it ). To customize it you can set custom ResizingGrip implementation on annotation instance. If you just want to change color or size you just need to pass them into constructor of EllipseResizingGrip. For custom shape you’ll need to reimplement IResizingGrip interface and render custom shape on Canvas at specified point and provide code to check if specified point hits ( is inside ) your custom shape
Hope this will help you!
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