TreeVIEW selectedditemchanged never triggered

[TheR7angelo]

Hello,

When I whent to detect a change in any control I generally use an event called Changed but in my TreeView control this event is not an event so we can't use it.

And when I want to recreate it with an TouchEvent none of SelectedItem or SelectedItems are filled with my selected item.
I think it's a bug or it's my fault and I don't know how to use your control ?

Property or event is expected
protected virtual void SelectedItemChanged()
in class UraniumUI.Material.Controls.TreeView

[mos379]

@enisn I prepared the code for this which I raise as PR after #873 has been merged.