Can you disable a RadRibbonBackstageItem button?

[Chris]

What I’m trying to do is to have a backstage button (Save) and a backstage list item (Save As) be disabled when there is no document open in the application. I’ve been able to bind IsEnabled successfully for the list item, but not the button. Is it possible to bind the IsEnabled property of a RadRibbonBackstageItem to a Boolean when that backstage item is functioning as a button (e.g. IsSelectable= “False”)? Even if I manually set the IsEnabled property to False rather than trying to bind it, the results are still an active “button”.

[Martin Ivanov]

Hello Chris,

I tested the IsEnabled button and its seem to work properly on my side. I created a new WPF application and used the following XAML to test this.

<telerik:RadRibbonView>
    <telerik:RadRibbonView.Backstage>
        <telerik:RadRibbonBackstage>
            <telerik:RadRibbonBackstageItem Header="Save" IsSelectable="False" IsEnabled="False"/>
        </telerik:RadRibbonBackstage>
    </telerik:RadRibbonView.Backstage>
</telerik:RadRibbonView>

Can you please try this also on your side and let me know if I am missing something?

Regards,
Martin Ivanov
Progress Telerik

[Chris]

Martin,

Thanks for the speedy response. If I stripped the item down to just Header, IsSelectable and IsEnabled everything worked as expected, including binding it to a Boolean on the view model. So we've got something else in our solution that's causing the trouble. The only remaining difference seems to be the command, so I'll start by digging in there. Appreciate the help in ruling out one part of the puzzle.

[Zhenyan]

Hi Chris, did you figure out what the difference the command makes in your case? I run into the same issue. Thanks.

[Zhenyan]

Martin,

 

Can you test the IsEnabled button and see if it works properly on your side?
Thank you,

<telerik:RadRibbonView>
    <telerik:RadRibbonView.Backstage>
        <telerik:RadRibbonBackstage>                   
            <telerik:RadRibbonBackstageItem Header="Save" IsSelectable="False" IsEnabled="False" Command="{Binding SaveCommand}"/>
        </telerik:RadRibbonBackstage>
    </telerik:RadRibbonView.Backstage>
</telerik:RadRibbonView>

[Martin Ivanov]

Hello Zhenyan,

Now I see what could be the original issue. The Command property usually interferes with the IsEnabled of the corresponding element. If the command's CanExecute handler returns False (the command is not allowed) the IsEnabled is automatically set to False. If CanExecute returns True, IsEnabled is also True. 

To resolve this, use the CanExecute command handler instead of IsEnabled.

Regards,
Martin Ivanov
Progress Telerik

[Zhenyan]

Martin,
Thanks for the speedy response. It works. Thanks