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
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