Binding error using RadDocking with DocumentHost

[Sean 2212]

Create a new WPF project, add a RadDocking to the page, then add a DocumentHost to the RadDocking, like so:

<telerik:RadDocking HasDocumentHost="True">
    <telerik:RadDocking.DocumentHost>
        <telerik:RadSplitContainer>
            <telerik:RadPaneGroup>
                <telerik:RadDocumentPane Header="Document 1" Title="Document 1" />
            </telerik:RadPaneGroup>
        </telerik:RadSplitContainer>
    </telerik:RadDocking.DocumentHost>
</telerik:RadDocking>

Run the app in debug mode and you'll get the following error in the VIsual Studio output window:

System.Windows.Data Error: 4 : Cannot find source for binding with reference 'ElementName=DropDownButtonElement'. BindingExpression:Path=IsChecked; DataItem=null; target element is 'DropDownMenu' (Name='DropDownMenuElement'); target property is 'IsOpen' (type 'Boolean')

Using version 2011.1.419.40. Noticed that there was a similar problem with the RadTabControl (see http://www.telerik.com/community/forums/wpf/tabcontrol/strange-error-message-in-debug-view.aspx). Can't reproduct the same error with RadTabControl. Suspect this is a similar issue. Doesn't cause any problems but would be nice to remove the error.

Can can anyone else confirm this?

[Yana]

Hello Sean,

We were able to reproduce this issue, I've logged it in our public issue tracking system and it will be fixed. You can track its progress here.

As a small token of gratitude for your involvement, I've updated your points.

Greetings,
Yana
the Telerik team

[Kristoffer]

I'm running the latest build of RadControls, and I also get this warning in the Debug window.

System.Windows.Data Warning: 4 : Cannot find source for binding with reference 'ElementName=DropDownButtonElement'. BindingExpression:Path=IsChecked; DataItem=null; target element is 'DropDownMenu' (Name='DropDownMenuElement'); target property is 'IsOpen' (type 'Boolean')

Wasn't this fixed?

[Yana]

Hi Kristoffer,

This issue is not fixed yet. I would suggest to track the PITS item in order to get notified when it is resolved.

Kind regards,
Yana
the Telerik team

[Amer]

Hi,
I'm new here and this is my first post , so I'd like to start by saying "a BIG Thank you" to all of Telerik team for your great work , I really love your components :)

Now back to the main thread issue, I know this is not critical and it is just a warning and can be safely ignored, but it is strange that it is still exists in the latest version "2013 Q3" ..

[Yana]

Hi Amer,

Thank you for the nice words.

Indeed, the fix wasn't  included in Q3 2013 release, we will do our best to fix it for some of the upcoming internal builds.

We're sorry for any inconvenience caused.

Regards,
Yana
Telerik

[Kristoffer]

Just like car enthusiasts want their car paint scratch free, software enthusiasts want their code free of warnings. Please fix this annoyance now!

This minor issue actually becomes quite expensive in the long run. When our developers see this warning they go 'Wait, what's that?!' - losing their concentration for a minute. So far, this annoyance has cost us $1800. (2011-2014, roughly two years with approximately 225 days per year. Four developers with a minute price of $1: 2*225*4*1=1800)

You get my point :)

[Yana]

Hello Kristoffer,

I understand and I'd like once again to apologize for the caused troubles.

We have moved the item into our new Telerik UI for WPF Feedback Portal, here is the link:
http://feedback.telerik.com/Project/143/Feedback/Details/113135-raddocking-with-documenthost-shows-a-binding-error-in-the-vs-output-window

and I have raised its priority as well.

Regards,
Yana
Telerik