So Ive to make new screens in xaml in combination with C# (WPF)

So I had something like this in the codebehind
titleBox.Text = Properties.Resources.someKey

The resources looks like
<data name="someKey">
<value>some text</value> <!-- this is some comment --> <!-- and another one -->
</data>

The title got as value "and another one", when I removed it it became "this is some comment" removing that resulted in the value "some text"