In Version 10.2.7 when you clicked on a polyline loaded from a shapefile you could set the property 'IsSelected' to true in the Graphic object and it will draw a line around itself. After upgrading to Version 100.7 the property is no longer there and I can not find a replacement.
Selecting graphics in a GraphicsOverlay:
Graphic.IsVisible Property
Selecting features in a FeatureLayer:
FeatureLayer.SelectFeature Method
FeatureLayer.SelectFeatures Method
FeatureLayer.SelectFeaturesAsync Method (QueryParameters, SelectionMode)
FeatureLayer.SelectFeaturesAsync Method (QueryParameters, SelectionMode, CancellationToken)
FeatureLayer.ClearSelection Method
FeatureLayer.UnselectFeature Method
FeatureLayer.UnselectFeatures Method
Thanks for the answer - it now works perfectly.
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