Code Quality: Retarget BladeView to ContentControl

[hez2010]

Expander is buggy and its OnApplyTemplate is not usable. Retarget it to ContentControl and remove the unused titlebar and expand (enlarge) features.

Resolves the missing styles and crashing issue.

[0x5bfa]

If you you like this SG for BladeItem for the sake of the simplicity:)
We use this in other controls like here.

[DependencyProperty<Brush>("CloseButtonBackground")]
[DependencyProperty<Visibility>("CloseButtonVisibility")]
[DependencyProperty<bool>("IsOpen", nameof(OnIsOpenPropertyChanged), DefaultValue = "true")]
[DependencyProperty<Brush>("CloseButtonForeground", DefaultValue = "(Brush)Colors.Black")]
public partial class BladeItem {}

protected virtual void OnIsOpenPropertyChanged(bool oldValue, bool newValue) {}

This is not well-made but it's because WCT Labs now has a much better SG and analyzers for this using partial props.

[hez2010]

If you you like this SG for BladeItem for the sake of the simplicity:)

Nope. This would hide those properties from being seen by other source generators. Today a source generator cannot see anything generated by another source generator.

[yaira2]

LGTM