Popup - is modal false not working

telerikPrimitives:RadPopup.Popup >
    <telerikPrimitives:RadPopup x:Name="popupError" IsOpen="False"
                                  IsModal="False" 
                                  OutsideBackgroundColor="#6F000000"
                                            Placement='Center' >
        <telerikMauiControls:RadBorder CornerRadius="8"
                                         BackgroundColor="#03446a">

            <Grid Padding="20"
                                WidthRequest="200"
                                HeightRequest="170">
                <Grid.RowDefinitions>
                    <RowDefinition Height="40" />
                    <RowDefinition Height="70" />
                </Grid.RowDefinitions>
                <Button Grid.Row="0"
                                    Padding="2"
                                   HorizontalOptions="End"
                                   Text="X"
                                   Clicked="OnClosePopup" 
                                  BackgroundColor="#03446a" TextColor="White" />
                <Label x:Name="labelError" Grid.Row="1" Text="" TextColor="White"/>
            </Grid>
        </telerikMauiControls:RadBorder>
    </telerikPrimitives:RadPopup>
</telerikPrimitives:RadPopup.Popup>