You can use Border instead of Frame, like this
<ScrollView Grid.Row="1" Orientation="Vertical" VerticalScrollBarVisibility="Always">
<StackLayout>
<ListView x:Name="listViewCheques" ItemsSource="{Binding ChequesList}" SelectionMode="None" Margin="5" RowHeight="100" HasUnevenRows="True" >
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell >
<ViewCell.ContextActions >
<!--روش command-->
<!--<MenuItem Text="Delete" IsDestructive="True" Command="{Binding Path=BindingContext.DeleteCommand , Source={Reference MylistView}}" CommandParameter="{Binding .}"/>-->
<!--Click-->
<!--روش command-->
<MenuItem Text="حذف" IsDestructive="True" Command="{Binding Path=BindingContext.DeleteChequesCommand, Source={Reference listViewCheques}}" CommandParameter="{Binding ID}"/>
<MenuItem Text="ارسال به سرور" IsDestructive="True" Command="{Binding Path=BindingContext.PostToRahkaran , Source={Reference listViewCheques}}" CommandParameter="{Binding ID}" />
<!--Click-->
<!--<MenuItem x:Name="BtnDelete" Text="حذف" IsDestructive="True" Clicked="BtnDelete_Clicked" />-->
</ViewCell.ContextActions>
<Border x:Name="framd2" BackgroundColor="WhiteSmoke" >
<Border.Background>
<LinearGradientBrush StartPoint="0,0" EndPoint="0,1">
<GradientStop Color="#6cc3f5" Offset="0.2"/>
<GradientStop Color="White" Offset="1"/>
</LinearGradientBrush>
</Border.Background>
<Border.StrokeShape>
<RoundRectangle CornerRadius="10"/>
</Border.StrokeShape>
<Grid Padding="0" RowDefinitions="*,*,*" ColumnDefinitions="*,*,*,*,*,*" CascadeInputTransparent="True" >
<Label Text="شناسه :" Grid.Row="0" Grid.Column="5" VerticalOptions="Center" HorizontalOptions="End" FontFamily="SGKara"/>
<Label Text="{Binding ID}" Grid.Column="4" VerticalOptions="Center" HorizontalOptions="End" FontFamily="SGKara"/>
<Label Text="تعداد چک:" Grid.Row="0" Grid.Column="3" VerticalOptions="Center" HorizontalOptions="End" FontFamily="SGKara"/>
<Label Text="{Binding ChequeCount}" Grid.Column="2" VerticalOptions="Center" HorizontalOptions="End" FontFamily="SGKara" FontSize="12"/>
<Label Text="تاریخ :" Grid.Row="0" Grid.Column="1" VerticalOptions="Center" HorizontalOptions="End" FontFamily="SGKara"/>
<Label Text="{Binding PersionDate}" Grid.Column="0" VerticalOptions="Center" HorizontalOptions="End" FontFamily="SGKara" FontSize="12"/>
<Label Text="ارسال:" Grid.Row="1" Grid.Column="5" VerticalOptions="Center" HorizontalOptions="End" FontFamily="SGKara"/>
<CheckBox IsChecked="{Binding IsSend}" Grid.Row="1" Grid.Column="4" VerticalOptions="Center" HorizontalOptions="End" IsEnabled="False"/>
<Label Text="استعلام:" Grid.Row="1" Grid.Column="3" VerticalOptions="Center" HorizontalOptions="End" FontFamily="SGKara"/>
<CheckBox IsChecked="{Binding IsAllinquery}" Grid.Row="1" Grid.Column="2" VerticalOptions="Center" HorizontalOptions="End" IsEnabled="False"/>
<Label Text="تایید:" Grid.Row="1" Grid.Column="1" VerticalOptions="Center" HorizontalOptions="End" FontFamily="SGKara"/>
<CheckBox IsChecked="{Binding IsAllAccept}" Grid.Row="1" Grid.Column="0" VerticalOptions="Center" HorizontalOptions="End" IsEnabled="False"/>
<Label Text="شرح :" Grid.Row="2" Grid.Column="5" VerticalOptions="Center" HorizontalOptions="End" FontFamily="SGKara"/>
<Label Text="{Binding Description}" Grid.Row="2" Grid.Column="2" Grid.ColumnSpan="6" VerticalOptions="Center" HorizontalOptions="End" FontFamily="SGKara" FontSize="12"/>
</Grid>
</Border>
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
</StackLayout>
</ScrollView>