Windowscommunitytoolkit: Add an Expander control

[ScottIsAFool]

Like the one silverlight used to have.

[Depechie]

Jan Joris created one some time ago: https://github.com/JanJoris/Expander
And there is another one here : https://github.com/deanchalk/ExpanderUWP

[ScottIsAFool]

Well if @janjoris fancied adding it, that would be great

[Depechie]

Yep, will 'bug' him about it :)

[JanDeDobbeleer]

I'll see if I can get this PR'ed somewhere next week.

[jgiacomini]

JanJoris if you dont work on it maybe can I take it?

[deltakosh]

I guess you can :)

[jgiacomini]

Good 👍 👍

[JanDeDobbeleer]

I completely forgot about this. Please take it, I do not have time to do this anytime soon 😕

[jgiacomini]

I have also wrotten my version of expander.
I have just to understand how to push it on git hub. ^^

[deltakosh]

As @Odonno did it already, why not contributing to his version and merging your code and effort? :)

[markti]

Is the plan to add the control to the main library of the UWP toolkit?

[ScottIsAFool]

@markti yes.

[Odonno]

@markti I am working on it

@jgiacomini If you can write your suggestions on the pull request, we will work to improve the control together.

[Odonno]

Thank you all for your comments.

@deltakosh I think we can close the issue.