Set the data context inside of a collectionview to the viewmodel / datacontext

[maslewandowski]

Hi guys,
I'm struggling to execute a command from a button inside of a collectionview.

I am using the devexpress components.

I bound data of my viewmodel to the collelctionview like this:
<dxcv:DXCollectionView ItemsSource="{Binding FairVisitData.FairVisitPhotos}">

The fairvisitdata class contains the property FairVisitPhotos which is of type List<KeyValuePair<string, Stream>>

I would like to access a command to remove one of the items in the list.

To achieve this, i need to bind the command from my viewmodel to the command property of a button inside of the collectionview.
<dxco:SimpleButton Command="{Binding RemovePhotoFairVisitPhotosCommand}" CommandParameter="{Binding Key}"/>

But the xaml binding failures are telling me, that the data context is set to the keyvaluepair:

How do i manually set the path of the binding to my current datacontext viewmodel?

Thanks for help

[maslewandowski]

Well looking for an answer to this problem for hours and then finally... got it.

Here is the solution in case someone has the same problem as i had:

<dxco:SimpleButton Command="{Binding Source={RelativeSource AncestorType={x:Type ContentPage}}, Path=BindingContext.RemovePhotoFairVisitPhotosCommand}" CommandParameter="{Binding Key}"/>

so relativesource sets the source to the contentpage itself.
but then it is very important to call the property "BindingContext".

greetings.