Problem in my view

Hi everyone,

I don't understand the view of my page.
I want that my boxview, listview, and buttons taking all my page.
Can you explain me where is the mistake ?

Thank you very much for your help,

Marie,

This is my code :
`<?xml version="1.0" encoding="utf-8" ?>

<ContentPage.Content>
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="*"/>
            <RowDefinition Height="*"/>
            <RowDefinition Height="*"/>
            <RowDefinition Height="*"/>
            <RowDefinition Height="*"/>
            <RowDefinition Height="*"/>
            <RowDefinition Height="*"/>
        </Grid.RowDefinitions>

        <BoxView Grid.Row="0" x:Name="BoxViewCoder" Style="{StaticResource boxviewStyle}"/>
        <Label Grid.Row="0" x:Name="TitleLabel" Style="{StaticResource labelStyle}" HorizontalOptions="Center" VerticalOptions="Center"/>

        <Label Grid.Row="1" x:Name="KLabel" Text="A" Style="{StaticResource labelFondBlancStyle}" HorizontalOptions="End"/>
        <Label Grid.Row="1" x:Name="CLabel" Text="B" Style="{StaticResource labelFondBlancStyle}" HorizontalOptions="Start" />

        <ListView Grid.Row="2" x:Name="tableE" Style="{StaticResource listViewStyle}" HorizontalOptions="FillAndExpand" VerticalOptions="FillAndExpand">
            <ListView.Header SeparatorVisibility="Default">
                <Grid BackgroundColor="#00A0CE" ColumnSpacing="3" >
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition Width="AUTO"/>
                        <ColumnDefinition Width="*"/>
                        <ColumnDefinition Width="*"/>
                    </Grid.ColumnDefinitions>
                    <Label Text="N" Grid.Column="0" Style="{StaticResource labellistViewStyle}" HorizontalOptions="Center" Margin="3"/>
                    <Label x:Name="MLabel" Text="M" Grid.Column="1" Style="{StaticResource labellistViewStyle}" HorizontalOptions="Center" />
                    <Label x:Name="ELabel" Text="E" Grid.Column="2" Style="{StaticResource labellistViewStyle}" HorizontalOptions="Center" />
                </Grid>
            </ListView.Header>

            <ListView.ItemTemplate SeparatorVisibility="Default">
                <DataTemplate>
                    <ViewCell>
                        <Grid BackgroundColor="LightBlue" ColumnSpacing="3">
                            <Grid.ColumnDefinitions>
                                <ColumnDefinition Width="AUTO"/>
                                <ColumnDefinition Width="*"/>
                                <ColumnDefinition Width="*"/>
                            </Grid.ColumnDefinitions>
                            <Label Grid.Column="0" Text ="{Binding N}" Style="{StaticResource labellistViewStyle}" HorizontalOptions="Center" Margin="3"/>
                            <Label Grid.Column="1" Text ="{Binding Me}" Style="{StaticResource labellistViewStyle}" HorizontalOptions="Center"/>
                            <Label Grid.Column="2" Text ="{Binding MeRef}" Style="{StaticResource labellistViewStyle}" HorizontalOptions="Center"/>
                        </Grid>
                    </ViewCell>
                </DataTemplate>
            </ListView.ItemTemplate>
        </ListView>


        <Button Grid.Row="3" x:Name="ButtonZ" Text="Z" Style="{StaticResource buttonStyle}" HorizontalOptions="Fill" VerticalOptions="FillAndExpand"/>
        <Button Grid.Row="4" x:Name="ButtonA" Text="A" Style="{StaticResource buttonStyle}" HorizontalOptions="FillAndExpand" VerticalOptions="FillAndExpand"/>
        <Button Grid.Row="4" x:Name="ButtonE" Text="E" Style="{StaticResource buttonStyle}" HorizontalOptions="FillAndExpand" VerticalOptions="FillAndExpand"/>
        <Button Grid.Row="5" x:Name="ButtonC" Text="C" Style="{StaticResource buttonStyle}" HorizontalOptions="FillAndExpand" VerticalOptions="FillAndExpand"/>

        <!-- OK / Annuler -->
        <Grid Grid.Row="6" Grid.ColumnSpan="4">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="*"/>
                <ColumnDefinition Width="*"/>
            </Grid.ColumnDefinitions>
            <Button x:Name="ButtonOK" Grid.Column="0" Text="{Translator:Translate OK}" Style="{StaticResource buttonStyle}" Clicked="onClickedOk"/>
            <Button x:Name="ButtonCancel" Grid.Column="1" Text="{Translator:Translate Annuler}" Style="{StaticResource buttonStyle}" Clicked="onClickedCancel"/>
        </Grid>
    </Grid>
</ContentPage.Content>

`

And this is the view I have :