Transitions on control unmount

[kerams]

OnLoaded in combination with DoubleTransition can be used for a fade-in animation when a popup/dropdown is brought into view. How would I achieve the reverse when the control is unmounted? Setting opacity to 0 in OnUnLoaded unsurprisingly has no effect and the control immediately disappears.

The TransitioningContentControl wrapper with CrossFade does what I need, but it has 2 drawbacks.

• You might need to create custom animation classes instead of making use of simple property value transitions
• You need to keep TransitioningContentControl in every place where a control with (un)mount animation is expected