TabControlEx creates 2 instances of the first ContentTemplate. #144
Description
Describe the bug
It appears that using the TabControlEx creates 2 instances of the first ContentTemplate.
I have an example and hopefully not too complicated repo of this issue. Please forgive me if my coding is the problem, however, I believe I have created a fairly standard TabControl ViewModel project.
The project creates an ObservableCollection of ViewModels and uses a TemplateSelector to find the datatemplate as indicated below.
<DataTemplate x:Key="TabBrowserDataTemplate"
DataType="{x:Type local:BrowserTabItemViewModel}">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="30" />
<RowDefinition Height="*" />
</Grid.RowDefinitions>
<Button Grid.Row="0"
Content="Main Tab Button" />
<local:BrowserTabItemUC Grid.Row="1" />
</Grid>
</DataTemplate>
In MainWindow.xaml I have the following TabControlEx implementation and normal TabControl implementation. You can just change over to see the difference;
<!--<cons:TabControlEx x:Name="BrowserTabControl"
SelectedIndex="{Binding BrowserTabControlSelectedIndex, Mode=TwoWay}"
ItemsSource="{Binding TabCollection}"
ContentTemplateSelector="{StaticResource selector}" />-->
<TabControl x:Name="BrowserTabControl"
SelectedIndex="{Binding BrowserTabControlSelectedIndex, Mode=TwoWay}"
ItemsSource="{Binding TabCollection}"
ContentTemplateSelector="{StaticResource selector}" />
If you put a break on the creation of the UserControl BrowserTabItemUC and then use either the Standard TabControl or TabControlEX you will see that TabControlEX creates 2 instances of the usercontrol, even though only 1 ViewModel was created and added to the TabControls TabCollection.