Xamarin ImageButton goes invisible after clicked - xaml

Question

I have an image button which when I click I want to change its Source (an empty star to a filled one) for the ratings.
My XAML:
<StackLayout Grid.Row="1" Orientation="Horizontal" Spacing="0">
<ImageButton Source="star_empty.png"
HeightRequest="40"
WidthRequest="40"
VerticalOptions="FillAndExpand" HorizontalOptions="FillAndExpand"
x:Name="star1"
BackgroundColor="Transparent"
Clicked="ImageButton_Clicked" />
<ImageButton Source="star_empty.png"
HeightRequest="40"
WidthRequest="40"
VerticalOptions="FillAndExpand" HorizontalOptions="FillAndExpand"
x:Name="star2"
BackgroundColor="Transparent"
Clicked="ImageButton_Clicked2" />
<ImageButton Source="star_empty.png"
HeightRequest="40"
WidthRequest="40"
VerticalOptions="FillAndExpand" HorizontalOptions="FillAndExpand"
x:Name="star3"
BackgroundColor="Transparent"
Clicked="ImageButton_Clicked3" />
<ImageButton Source="star_empty.png"
HeightRequest="40"
WidthRequest="40"
x:Name="star4"
VerticalOptions="FillAndExpand" HorizontalOptions="FillAndExpand"
BackgroundColor="Transparent"
Clicked="ImageButton_Clicked4" />
<ImageButton Source="star_empty.png"
HeightRequest="40"
WidthRequest="40"
x:Name="star5"
VerticalOptions="FillAndExpand" HorizontalOptions="FillAndExpand"
BackgroundColor="Transparent"
Clicked="ImageButton_Clicked5" />
</StackLayout>
The View class:
private void ImageButton_Clicked(object sender, EventArgs e)
{
star1.Source = "star_full.png";
int rating = 1;
}
What could be the issue? The Source does change, it just blinks then goes invisible. I set the isVisible property to true, that doesn't help.

Answer 1

Define the type of ImageSource you are using; file, resource, uri, stream:
Example:
star1.Source = ImageSource.FromResource("star_full.png");
Update:
<StackLayout Grid.Row="1" Orientation="Horizontal" Spacing="0">
<ImageButton x:Name="star1" Source="star_off.png" BackgroundColor="Transparent" Clicked="ImageButton_Clicked"/>
<ImageButton x:Name="star2" Source="star_off.png" BackgroundColor="Transparent" Clicked="ImageButton_Clicked"/>
<ImageButton x:Name="star3" Source="star_off.png" BackgroundColor="Transparent" Clicked="ImageButton_Clicked"/>
<ImageButton x:Name="star4" Source="star_off.png" BackgroundColor="Transparent" Clicked="ImageButton_Clicked"/>
<ImageButton x:Name="star5" Source="star_off.png" BackgroundColor="Transparent" Clicked="ImageButton_Clicked"/>
</StackLayout>
Code behind:
void ImageButton_Clicked(object sender, System.EventArgs e)
{
(sender as ImageButton).Source = ImageSource.FromFile("star_on.png");
}