Rock on, sorted. Thanks Matt. From: [email protected] [mailto:[email protected]] On Behalf Of Matt Hamilton Sent: Monday, 12 December 2011 11:53 AM To: ozWPF Subject: Re: Expander Header via style throws error
Steve, Set your style to be non-shared so it has its own instance across both expanders: <Style x:Key="ExpanderStyle" x:Shared="False" TargetType="Expander"> HTH, Matt From: Steven Nagy<mailto:[email protected]> Sent: Monday, December 12, 2011 12:21 PM To: [email protected]<mailto:[email protected]> Subject: Expander Header via style throws error Hiyas, Really simple to recreate this issue, just paste in this code to a new WPF project: <Grid> <Grid.RowDefinitions> <RowDefinition Height="*" /> <RowDefinition Height="*" /> </Grid.RowDefinitions> <Grid.Resources> <Style x:Key="ExpanderStyle" TargetType="Expander"> <Setter Property="Header"> <Setter.Value> <Grid> <TextBlock Text="Foo" /> </Grid> </Setter.Value> </Setter> </Style> </Grid.Resources> <Expander Style="{StaticResource ExpanderStyle}" /> <Expander Style="{StaticResource ExpanderStyle}" Grid.Row="1" /> </Grid> Essentially, 2 expanders using the same style to set the header. Throws this exception: “'Set property 'System.Windows.FrameworkElement.Style' threw an exception.' Line number '23' and line position '10'” Inner exception: “Specified element is already the logical child of another element. Disconnect it first.” However if you sacrifice the complex header content for something simple like this, it works fine: <Setter Property="Header" Value="Foo" /> Any ideas why this is the case? Using style inheritance from the same base style causes same issue. However if I blanket copy paste the style with a new name and point the expander to that, then it also works fine. So it’s not the header content that’s the problem specifically. I’m guessing some sort of virtualisation similar to what the tab control does with tab pages under binding scenarios; it is using the same actual Grid control and applying it to both headers, thus the inner exception above. No idea how to fix it though (other than copying pasting styles which I really don’t want to do). Cheers, Steve ________________________________ _______________________________________________ ozwpf mailing list [email protected]<mailto:[email protected]> http://prdlxvm0001.codify.net/mailman/listinfo/ozwpf
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