Xamarin Forms Binding to Parent Control - binding

Question

I'm building a Xamarin Forms application and am trying to reference the binding context of a parent control from a DataTemplate:
<flv:FlowListView Grid.Row="3" x:Name="abc"
Grid.Column="0"
Grid.ColumnSpan="2"
FlowColumnCount="3"
SeparatorVisibility="None"
HasUnevenRows="true"
FlowItemsSource="{Binding ProductPackageBatch}"
FlowLastTappedItem="{Binding LastTappedItem}"
FlowItemTappedCommand="{Binding ItemTappedCommand}">
<flv:FlowListView.FlowColumnTemplate>
<DataTemplate>
<StackLayout Margin="5, 10, 10, 5">
<StackLayout.Children>
<Frame Padding="2"
OutlineColor="{DynamicResource ProductGridImageBorderColor}"
HasShadow="False"
BackgroundColor="{DynamicResource ProductGridBackgroundColor}">
<Image Aspect="AspectFit"
WidthRequest="100"
Source="{Binding ImageBase64, Converter={StaticResource Base64ToImageConverter}}">
<Image.HeightRequest>
<OnPlatform x:TypeArguments="x:Double"
iOS="100"
Android="150" />
</Image.HeightRequest>
</Image>
</Frame>
<Label Style="{StaticResource ProductGridName}"
Text="{Binding Name}" />
<Label Style="{StaticResource ProductGridFormattedPrice}"
Text="{Binding FormattedPrice}"
FontAttributes="Bold" />
<Button BackgroundColor="{DynamicResource BuyButtonColor}"
TextColor="{DynamicResource TextColor}"
BorderRadius="0"
Margin="5, 0, 5, 0"
VerticalOptions="End"
Text="Buy"
Command="{Binding Source={x:Reference abc}, Path=BindingContext.AddToUserCartCommand}"
CommandParameter="{Binding .}" />
</StackLayout.Children>
</StackLayout>
</DataTemplate>
</flv:FlowListView.FlowColumnTemplate>
</flv:FlowListView>
There is an event called on AddToUserCartCommand that I want to call from a button in the FlowListView. I've tried a few different ways to reference the control, but the method never gets called. The following button sits outside this control and works ok:
<Button Grid.Row="4"
Margin="30"
BackgroundColor="{DynamicResource BuyButtonColor}"
TextColor="{DynamicResource TextColor}"
BorderRadius="0"
Text="Add to Cart"
Command="{Binding AddToUserCartCommand}"
CommandParameter="{Binding ProductPackage.Id}" />
Can anyone help explain what I'm doing wrong?

Answer 1

Set the correct binding context of the Command and CommandParamter:
<Button BackgroundColor="{DynamicResource BuyButtonColor}"
BindingContext="{x:Reference Name=abc}"
TextColor="{DynamicResource TextColor}"
BorderRadius="0"
Margin="5, 0, 5, 0"
VerticalOptions="End"
Text="Buy"
Command="{Binding Path=BindingContext.AddToUserCartCommand}"
CommandParameter="{Binding Path=BindingContext.ProductPackage.Id}" />