Checkbox in header triggers command "sometimes"

[Robert]

The strangest thing is happening with my GridView when I try to add a custom datacolumn with a checkbox in and a GridViewColumn.Header, to add anothner checkbox, that should select all checkboxes in the list, pretty standard. 

I have the code below, but when I click  the "check all"-checkbox, I do not get the Command send to my event handler, nothing happens. Now the strange part

If I, while running the application, change the markup (below) AncestorType={x:Type UserControl}}, to AncestorType={x:Type local:MyView}} it works, I get my event. Hip horray, right? Nope. If I restart the application, nothing happens again, until I change it back to the original and things are working again

 

Why, oh Telerik-Gods, why! :D

snippet below:

 

<telerik:GridViewColumn  >
    <telerik:GridViewColumn.Header>
        <CheckBox IsChecked="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type UserControl}}, Path=DataContext.IsAllChecked, Mode=TwoWay}"                                                                                   
                    Command="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type UserControl}}, Path=DataContext.SelectAllRowsCommand}">
              

        </CheckBox>
    </telerik:GridViewColumn.Header>

[Robert]

...so to clarify, both versions ofAncestorType works, (my view and UserContro), but I need to touch the file at runtime to get the Command to trigger. I have also a Button that triggers that Command everytime, like a Champ

[Dilyan Traykov]

Hello Robert,

Thank you for the provided code snippet.

Based on it, I tried replicating the issue you described in a small sample project, however, the command is invoked successfully each time the checkbox is clicked at my end. Can you please have a look and let me know if I'm missing something of importance?

With your description in mind, it seems that the binding is not evaluated initially and is only reevaluated once you change the markup. I assume that this has to do with the exact position of the checkbox in the visual tree so please specify what other controls/panels hold the RadGridView instance so that I can further investigate.

I will be awaiting your reply.

Regards,
Dilyan Traykov
Progress Telerik