Bind mvvm light Relaycommand to page loading event - mvvm

Question

I am working on Window phone 8.1.
I have a RelayCommand command which executes some method async.
I want to know how can I bind a page load event from a page to the RelayCommand in the view model?
All the example I see are binding RelayCommand to a Button.
How can I bind that to page load event? I see some example uses EventToCommand. But I am using Window phone 8.1, I dont' think I have the behaviour stuff some article I saw.

Answer 1

Make sure you add Behaviors extension to your References
then define that the event trigger invokes a command:
<Page
x:Class="App31.PivotPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:App31"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:data="using:App31.Data"
xmlns:i="using:Microsoft.Xaml.Interactivity"
xmlns:core="using:Microsoft.Xaml.Interactions.Core"
mc:Ignorable="d">
<i:Interaction.Behaviors>
<core:EventTriggerBehavior EventName="Loaded">
<core:InvokeCommandAction Command="{Binding MyCommandInTheViewModel}" />
</core:EventTriggerBehavior>
</i:Interaction.Behaviors>
//....
//.. rest of page code
Where MyCommandInTheViewModel is the command in your VM, and the DataContext of the page is set to your VM.