[Bug] RadioButtons with two or more groups doesn't initialize correctly in UWP

[jessiezh0320]

Description

RadioButtons with two or more groups doesn't initialize correctly in UWP.

Steps to Reproduce

1. create a new xamarin forms app and use the following code in one page;

      <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="100" />
            <RowDefinition Height="100" />
        </Grid.RowDefinitions>
   
        <StackLayout RadioButtonGroup.GroupName="People"
                 Grid.Row="0">
            <RadioButton 
                GroupName="Person"
                Content="Bob"/>
            <RadioButton
                GroupName="Person"
                Content="Ray"
                IsChecked="True"/>
        </StackLayout>
   
        <StackLayout RadioButtonGroup.GroupName="Colours" 
                     Grid.Row="1">
            <RadioButton
                GroupName="Colour"
                Content="Red"
                IsChecked="True"/>
            <RadioButton 
                GroupName="Colour"
                Content="Yellow"/>
        </StackLayout>
    </Grid>

2. please use the latest version of nuget xamarin form(5.0.0.2012) and Xamarin.Essentials v1.6.1.
3. build and deploy to uwp ;

Expected Behavior

Hope the RadioButtons with two or more groups could initialize correctly in uwp.

Actual Behavior

RadioButtons with two or more groups doesn't initialize correctly in UWP.

Basic Information

Environment

[pledi]

I also encounter the described problem when working with two or more RadioButtonGroups on a UWP build.

[zleao]

Same here! Once the second group is created, the first one will get all its RadioButtons unselected

[holecekp]

I have the same problem. The bug is also in the latest 5.0.0.2244. I have found two possible workarounds:

Workaroud 1: Use a ControlTemplate. Only RadioButtons without ControlTemplate are affected.

Workaround 2: If you have your code for setting the initial values for RadioButtons in a method named e.g. InitRadioButtons(), do not call it directly. Instead, put the following line at the end of OnAppearing:

Task.Run(() => MainThread.InvokeOnMainThreadAsync(InitRadioButtons));