when go second tab and select another tab , the content will go back 1st tab content
<tabView:SfTabView VisibleHeaderCount="4" TabHeaderPosition="Bottom">
<!--tab1-->
<tabView:SfTabItem Title="NEWS">
<tabView:SfTabItem.Content>
<tabView:SfTabView BackgroundColor="Gainsboro" >
<tabView:SfTabItem Title="Ahmed">
<tabView:SfTabItem.Content>
<Grid BackgroundColor="Red" />
</tabView:SfTabItem.Content>
</tabView:SfTabItem>
<tabView:SfTabItem Title="yacine">
<tabView:SfTabItem.Content>
<Grid BackgroundColor="Green" />
</tabView:SfTabItem.Content>
</tabView:SfTabItem>
</tabView:SfTabView>
</tabView:SfTabItem.Content>
</tabView:SfTabItem>
<!--tab2-->
<tabView:SfTabItem Title="Shop">
<tabView:SfTabItem.Content>
<tabView:SfTabView BackgroundColor="Gainsboro" >
<tabView:SfTabItem Title="Ahmed2">
<tabView:SfTabItem.Content>
<Grid BackgroundColor="Red" />
</tabView:SfTabItem.Content>
</tabView:SfTabItem>
<tabView:SfTabItem Title="yacine3">
<tabView:SfTabItem.Content>
<Grid BackgroundColor="Pink" />
</tabView:SfTabItem.Content>
</tabView:SfTabItem>
</tabView:SfTabView>
</tabView:SfTabItem.Content>
</tabView:SfTabItem>
<!--tab3-->
<tabView:SfTabItem Title="NEWS3" x:Name="tab14">
<tabView:SfTabItem.Content>
<tabView:SfTabView BackgroundColor="Gainsboro" >
<tabView:SfTabItem Title="Ahmed2">
<tabView:SfTabItem.Content>
<Grid BackgroundColor="Red" />
</tabView:SfTabItem.Content>
</tabView:SfTabItem>
<tabView:SfTabItem Title="yacine3">
<tabView:SfTabItem.Content>
<Grid BackgroundColor="Pink" />
</tabView:SfTabItem.Content>
</tabView:SfTabItem>
</tabView:SfTabView>
</tabView:SfTabItem.Content>
</tabView:SfTabItem>
<!--tab4-->
<tabView:SfTabItem Title="NEWS4" x:Name="tab15">
<tabView:SfTabItem.Content>
<StackLayout x:Name="tab4">
<Label Text="tab12"></Label>
</StackLayout>
</tabView:SfTabItem.Content>
</tabView:SfTabItem>
</tabView:SfTabView>