How to enable the mouse wheel in ScrollViewer

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There are areas of the Silverlight ScrollViewer where the mouse wheel does not work. It seems that the place where the control with the background color is on is effective, and the other parts do not work.

To enable it for the entire ScrollViewer, it seems that you should do the following.

<ScrollViewer Background="Transparent">

The color seems to be okay with opaque or translucent.