I have a list view. On Tapping the selected row, how do I deselect? If I select a different row which is not selected, it must select it. How do I do this? Thanks

```
  <ListView x:Name="DimensionListView" HasUnevenRows="True"  ItemTapped="OnItemSelected"  SeparatorVisibility="Default" VerticalOptions="FillAndExpand"  >

```