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I have a GridView which lists all my Products. The first column is a "GridViewToggleRowDetailsColumn" which expands a Details-View when clicked.

I use CaliburnMicro to load the Details-View like so:

 <telerik:RadGridView ItemsSource="{Binding Products.View}"
                             SelectedItem="{Binding SelectedProduct,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}"
                             AutoGenerateColumns="False"                                 
                             EnableRowVirtualization="False"
                             ShowGroupPanel="False"
                             RowDetailsVisibilityMode="Collapsed"
                             RowIndicatorVisibility="Collapsed"
                             cal:Message.Attach="[Event RowDetailsVisibilityChanged] = 
[Action OnRowDetailsVisibilityChanged($eventArgs)]">

<telerik:RadGridView.RowDetailsTemplate>
  <DataTemplate>  
    <ContentControl cal:View.Model="{Binding DataContext.ProductDetailsViewModel, RelativeSource={RelativeSource FindAncestor, AncestorType=telerik:RadGridView}}" />
  </DataTemplate>
</telerik:RadGridView.RowDetailsTemplate>
   <telerik:GridViewToggleRowDetailsColumn />

    ...Columndefinitions...

</telerik:RadGridView>

I can open and close the details as long as I stay on the same product. The problem occurs if I open the details while another details is already visible. Then the details of the first disappears and never comes back. See the screenshot: Image

The grey box is a placeholder for the details. I opened the details of the first 8 items one after another, but only the last one is showing. My guess is that Caliburn Micro can not locate the View anymore, but I have no idea why? Because I only have one ProductDetailsViewModel?

Also: in debug mode i noticed that the "ProductDetailsViewModel"-getter is accessed only once per item after expanding the row. Collapsing and expanding the same row does not access the getter again.

UPDATE: Another approach, same effect: I say my ItemsSource is a collection of ProductDetailsViewModel and inherit my MainViewModel from Conductor<ProductDetailsViewModel>.Collection.OneActive, make the Grid binding with

ItemsSource = "{Binding Items}"

and in the xaml

<ContentControl cal:View.Model="{Binding DataContext.ActiveItem, RelativeSource={RelativeSource FindAncestor, AncestorType=telerik:RadGridView}}" />

in the SelectionChanged I do

ActivateItem(e.Row.Item as ProductDetailsViewModel);

Same as before, the ProductDetailsView is displayed for the current item, but disappears once I show the details of another product.

user3755567
  • 88
  • 5

1 Answers1

2

The problem was the view-caching of "IViewAware", which is automatically implemented by screens. Overwriting the "GetView" in the ProductDetailsViewModel solved the issue.

Related: Screens shared in multiple screens disappear after deactivation in Caliburn.Micro

user3755567
  • 88
  • 5