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QuestionIs it possible to do event handling in the ViewModel? Pin
Code4Ever16-Jul-22 6:39
Code4Ever16-Jul-22 6:39 
AnswerRe: Is it possible to do event handling in the ViewModel? Pin
Gerry Schmitz17-Jul-22 6:06
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QuestionDICOM TAGS Pin
harol espinosa26-Jun-22 5:20
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AnswerRe: DICOM TAGS Pin
Dave Kreskowiak26-Jun-22 6:13
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QuestionDevelopment Pin
User 156237373-Jun-22 10:46
User 156237373-Jun-22 10:46 
AnswerRe: Development Pin
Gerry Schmitz4-Jun-22 10:35
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GeneralRe: Development Pin
User 156237376-Jun-22 4:22
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QuestionTreeView in ControlTemplate - Handling Item Expanded Pin
Kevin Marois27-Apr-22 9:46
professionalKevin Marois27-Apr-22 9:46 
I am creating a Custom Control and in the control template I have a TreeView class in it.
<Style TargetType="{x:Type local:MyControl}">

    <Setter Property="Template">


            <ControlTemplate TargetType="{x:Type local:MyControl}">

                <Border Background="{TemplateBinding Background}"
                    BorderBrush="{TemplateBinding BorderBrush}"
                    BorderThickness="{TemplateBinding BorderThickness}">

                    <TreeView ItemsSource="{Binding TreeDataItems, RelativeSource={RelativeSource TemplatedParent}}">

                            <HierarchicalDataTemplate DataType="{x:Type local:TreeItem}" ItemsSource="{Binding Children}">
                                <TextBlock Text="{Binding Path=Caption}" />

                            <i:EventTrigger EventName="TreeViewItem.Expanded">
                                <i:InvokeCommandAction Command="{Binding TreeItemExpandedCommand, RelativeSource={RelativeSource TemplatedParent}}"






In the code behind I have
private ICommand _TreeItemExpandedCommand;
public ICommand TreeItemExpandedCommand
        if (_TreeItemExpandedCommand == null)
            _TreeItemExpandedCommand = new RelayCommand<object>(p => TreeItemExpandedExecuted(p));
        return _TreeItemExpandedCommand;

private void TreeItemExpandedExecuted(object args)

When I expand a node nothing happens. There are no binding errors, and the Command's getter fires when it starts, but the TreeItemExpandedExecuted never fires.

I tried using the event itself:
<TreeView TreeViewItem.Expanded="TreeViewItem_Expanded">


 private void TreeViewItem_Expanded(object sender, RoutedEventArgs e)
        TreeViewItem tvi = e.OriginalSource as TreeViewItem;
        if (tvi != null)
          // Do something
But still nothing.

I'm guessing this has something to do with this all being in a ControlTemplate. Anyone see what's wrong here?
If it's not broken, fix it until it is.
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QuestionWPF DataGridCell Binding Problem Pin
Kevin Marois7-Apr-22 14:39
professionalKevin Marois7-Apr-22 14:39 
AnswerRe: WPF DataGridCell Binding Prolem Pin
Richard Deeming7-Apr-22 21:36
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GeneralRe: WPF DataGridCell Binding Prolem Pin
Kevin Marois8-Apr-22 5:38
professionalKevin Marois8-Apr-22 5:38 
GeneralRe: WPF DataGridCell Binding Prolem Pin
Kevin Marois13-Apr-22 7:59
professionalKevin Marois13-Apr-22 7:59 
GeneralRe: WPF DataGridCell Binding Prolem Pin
Richard Deeming18-Apr-22 21:45
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QuestionCode Behind Data Grid Style Issue Pin
Kevin Marois6-Apr-22 15:01
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SuggestionRe: Code Behind Data Grid Style Issue Pin
Richard Deeming6-Apr-22 22:37
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AnswerRe: Code Behind Data Grid Style Issue Pin
Gerry Schmitz7-Apr-22 6:42
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GeneralRe: Code Behind Data Grid Style Issue Pin
Kevin Marois7-Apr-22 14:34
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Questiontrack active split view Pin
Super Lloyd5-Apr-22 13:47
Super Lloyd5-Apr-22 13:47 
QuestionViewModel Locator Pin
Kevin Marois5-Apr-22 7:48
professionalKevin Marois5-Apr-22 7:48 
AnswerRe: ViewModel Locator Pin
Super Lloyd5-Apr-22 13:56
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SuggestionRe: ViewModel Locator Pin
Richard Deeming5-Apr-22 21:27
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AnswerRe: ViewModel Locator Pin
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GeneralRe: ViewModel Locator Pin
Kevin Marois6-Apr-22 6:11
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QuestionIs it possible to share SQL Server database between WPF application and Ionic application Pin
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Alex Dunlop28-Mar-22 7:03 

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