WPF checkbox Tag is null eventhough it is set in XAML

c#, wpf, xaml

Solution

The Checked property is set right on the XAML loading, when you set IsChecked="True". The tag may be loaded only later when the XAML loading code decides to set this property. That's why you can see uninitialized properties.

Problem

I am trying to make use of the Tag property of the WPF checkbox. This is my XAML: ``` <CheckBox Content="BTC/USD" HorizontalAlignment="Left" Margin="14,0,0,41" VerticalAlignment="Bottom" IsChecked="True" Checked="CheckBox_Checked" Tag="btcusd" Unchecked="CheckBox_Checked"/> ``` When I open my app, `CheckBox_Checked` is called immediately, but the sender's Tag property is null. Why can this happen?

Original source