When you are working with XAML controls, you will find that not all controls have a Content property.
There is an article over at C# Corner called Understanding the Content Property in XAML.
The built-in content controls come in three major types:
- Buttons – Button, RepeatButton, ToggleButton, CheckBox, RadioButton
- Simple Containers – Label, ToolTip, Frame
- Containers with Headers – GroupBox, Expander