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Floating Action Button with Listview inside a TabbedPage.

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I want to add FAB in a view that has listview in it and that view is in TabbedPage Contentpage.
Here is my code (Giving Error : The property 'Content' is set more than once.

<TabbedPage xmlns="..." xmlns:x="..." xmlns:fab="clr-namespace:FAB.Forms;assembly=FAB.Forms" x:Class="IIOT_PB.Views.DevView" Title="{DynamicResource projectopen}" BarBackgroundColor="#1976D2"> <ContentPage Title="Devices"> <ContentPage.Content> <ListView x:Name="devicesList" VerticalOptions="Fill" HorizontalOptions="Fill" SeparatorVisibility="Default" RowHeight="55" BackgroundColor="{DynamicResource backgroundColor}" ItemTapped="DevicesList_ItemTapped" SelectionMode="None"> <ListView.ItemTemplate> <DataTemplate> <ViewCell> <StackLayout Orientation="Horizontal" VerticalOptions="Fill" HorizontalOptions="Fill"> <StackLayout VerticalOptions="StartAndExpand" HorizontalOptions="StartAndExpand" Orientation="Vertical"> <Label Text="{Binding name}" FontSize="Small" FontAttributes="Bold" VerticalOptions="Start" TextColor="{DynamicResource textColor}"/> <Label Text="{Binding description}" LineBreakMode="TailTruncation" WidthRequest="250" FontSize="Small" VerticalOptions="StartAndExpand" TextColor="{DynamicResource textColor}"/> </StackLayout> <ImageButton Padding="15,15,15,15" Source="about.png" Clicked="Button_Clicked" VerticalOptions="End" AutomationId="{Binding id}" HorizontalOptions="Fill" BackgroundColor="Transparent"/> </StackLayout> </ViewCell> </DataTemplate> </ListView.ItemTemplate> </ListView> <fab:FloatingActionButton x:Name="FAB" HorizontalOptions="CenterAndExpand" WidthRequest="50" HeightRequest="50" VerticalOptions="CenterAndExpand"/> </ContentPage.Content> </ContentPage>


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