StackPanelPage Error when RadioButton_Checked is called

[olivertech]

Which version of the app?

WinUI 3 Gallery

Description

There is an error on StackPanelPage.xaml.cs when this is called for the first time:

Original Line 26:

string orientationName = rb.Tag.ToString();

Updated Line:

string orientationName = rb.Content.ToString();

Screenshots

Windows version

No response

Additional context

No response

[AndrewKeepCoding]

I can't reproduce this issue. Additionally, as you can see in StackPanelPage.xaml.cs, each RadioButton's Tags is correct.

<RadioButtons x:Name="OrientationGroup" Header="Orientation">
    <RadioButton Content="Horizontal" Tag="Horizontal" Checked="RadioButton_Checked" />
    <RadioButton Content="Vertical" Tag="Vertical" Checked="RadioButton_Checked" IsChecked="True" />
</RadioButtons>

Can you reproduce this on the latest main branch?

[olivertech]

I have gotten the last version of the project. Despite of the control has the Tag attribute, here, when I access this page for the first time, I got the error... Changing to Content, I made it runs... And Yes, I have gotten the lastest main branch.

[AndrewKeepCoding]

I wonder what might be causing the difference.🤔

[RichardNairn]

Can confirm both the issue and fix in the latest main build.

[marcelwgn]

Seems like this is a WinUI issue. The Checked event gets raised before the element is completely created. In our case, the vertical item is not part of the RadioButtons yet and not fully created yet the event got raised for it.

[Jay-o-Way]

Note: the properties are actually processed in order of appearance. Moving IsChecked to the end also works! Downside: Xaml Styler 😖 If you want to work around that one, I would try to use an IsLoaded (on RadioButtonS) event and then set the "vertical" radiobutton to checked.

[Zakariathr22]

I'm experiencing the same issue on the VariableSizedWrapGrid page.

[Zakariathr22]

the same issue on the ViewBox Page