Pen Control

Hi
I am trying to build a simple note app.
The first screen "Selection" has a gallery where all the drawings are shown.
When the user clicks on one it navigates to the second screen "Drawing" with a pen control.
When the user clicks the back button on the "Drawing" screen I use the onInvisible event to Collect(Collection1,Pen1!Image)
This collection is attached to the gallery as data source.
The gallery works good every time the user goes back a image is added.
But my question is now, when the user clicks on one Image element of the gallery the Pen Control should load the Image clicked.
I tried the onVisible event with Pen1!Image!Url = Gallery1!Selected!Image1!Image
It gets accepted without error but nothing happens. The Window Changes but the Pen1!Image is not changed.
And the other thing I would like to do is clearing the Pen1!Image when the user clicks a "New Drawing" button on the gallery screen.
Thank you in advance for your help

You need to collect the pen strokes. Assuming you need the images as well, you can use: Collect(Collection1, {I:Pen1!Image,S:Pen1!Strokes}) as the rule for your onInvisible property.
Set the Data>Image property of the image control to: ThisItem!I!Url. This will display the images as before.
Set the Behavior>OnSelect property of the image control to: UpdateContext({selectedItem:First(Gallery1!AllItems)!S!Url}); UpdateContext({selectedItem:ThisItem!S!Url}) -- this sets the context variable selectedItem to strokes for the current item. The
first UpdateContext rule is there to set a default, so the second one triggers the change.
Now, set the Data>DefaultStrokes property of the pen control to: selectedItem -- this will cause it to pick up the strokes for the item selected in the gallery.
For clearing the pen, set the Behavior>OnSelect property of your "New Drawing" button to: UpdateContext({penClear:true});UpdateContext({penClear:false}). Set the Data>Clear property of the pen control to: penClear.
Thanks
Robin

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I have uploaded an example of this called Pen Control to the following:
https://onedrive.live.com/#cid=5CEEF21796F5830D&id=5CEEF21796F5830D%218724
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CTRLpen and PenClear are names I made up. You can replace them with whatever names you want to use, as long as they are not names reserved by Siena.
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Pen Control

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