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POWPF ComboBox selection change on TabItem selection change
 

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  1. POWPF ComboBox selection change on TabItem selection change
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    <p>I have a combobox in a tab item in MVVM. This tab can be created multiple times in my application (same view, same view model but different instance), so I can switch from one tab to another (but they are tab of the same type).</p> <p>It works perfectly with every WPF control, but with combobox I have a strange behaviour: the focus tab, when it loses focus, gets the selected item of the combox box of the tab that the application is focusing on.</p> <p>If I switch from 2 tabs that are not of the same type everything works correctly, any idea about that? Thanks.</p> <p>XAML:</p> <pre><code>&lt;CollectionViewSource x:Key="StatusView" Source="{Binding Path=StatusList}"/&gt; &lt;ComboBox Name="_spl2Status" Grid.Column="3" Grid.Row="0" ItemsSource="{Binding Source={StaticResource StatusView}}" SelectedValue="{Binding Path=CurrentSPL2.ID_SPL2_STATUS, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" SelectedValuePath="FL_TYPE" DisplayMemberPath="ID_TYPE"&gt; &lt;/ComboBox&gt; </code></pre> <p>VM:</p> <pre><code>public List&lt;NullableByteEnumType&gt; StatusList { get { return (SPC_SPL2.SPL2StatusCollection.Skip(1)).ToList(); } } private SPC_SPL2 _currentSPL2 = null; public SPC_SPL2 CurrentSPL2 { get { if (_currentSPL2== null) Controller.Execute(delegate(IResult result) { Dictionary&lt;string, object&gt; parameters = new Dictionary&lt;string, object&gt;(); parameters.Add("FL_ACTIVE", true); parameters.Add("ID_SPL2", _itemcode); Model.Invalidate(typeof(SPC_SPL2), Filter.GENERIC&lt;SPC_SPL2&gt;(parameters, "ID_SPL2")); Model.Include&lt;SPC_SPL2&gt;(); if (Model.Appendload(result) == false) return false; Debug.Assert(Context.SPC_SPL2.Count == 1); _currentSPL2= Context.SPC_SPL2.FirstOrDefault(); return result.Successful; }); return _currentSPL2; } set { _currentSPL2= value; OnPropertyChanged(() =&gt; CurrentSPL2); } } </code></pre> <p>my tabs are handled in this way:</p> <pre><code>&lt;Grid&gt; &lt;Border Grid.Row="0"&gt; &lt;ContentControl Content="{Binding Path=Workspaces}" ContentTemplate="{StaticResource MasterWorkspacesTemplate}" /&gt; &lt;/Border&gt; &lt;/Grid&gt; </code></pre> <p>where</p> <pre><code> &lt;DataTemplate x:Key="MasterWorkspacesTemplate"&gt; &lt;TabControl IsSynchronizedWithCurrentItem="True" BorderThickness="0" ItemsSource="{Binding}" SelectedItem="{Binding}" ItemContainerStyleSelector="{StaticResource TabItemTemplate}" /&gt; &lt;/DataTemplate&gt; </code></pre> <p>and workspaces (my viewmodels list) (T is a class who inherit from viewModelBase)</p> <pre><code> public T CurrentWorkspace { get { return WorkspacesView.CurrentItem as T; } } private ObservableCollection&lt;T&gt; _workspaces; public ObservableCollection&lt;T&gt; Workspaces { get { if (_workspaces == null) { _workspaces = new ObservableCollection&lt;T&gt;(); _workspaces.CollectionChanged += _OnWorkspacesChanged; } return _workspaces; } } protected ICollectionView WorkspacesView { get { ICollectionView collectionView = CollectionViewSource.GetDefaultView(Workspaces); Debug.Assert(collectionView != null); return collectionView; } } </code></pre>
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    1. USandrea
    1. USandrea
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    1. COPls, add some code of the view with the `ComboBox` and the bound VM.
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    2. COI add some code, thanks in advance for your help
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    3. COCan you show how you initialize the viewmodel, and what MVVM framework are you using?
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      1. USJ King
 

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