WPF, C# - change selected tab by doubleclick on a datagrid's row

Question

I have a datagrid which is in a tabcontrol item. When i doubleclick the row in the datagrid, i want the tabcontrol to change the tab.

Heres my code:

<TabItem
            x:Name="tiDashboard"
            Header="Dashboard"
            Background="White">

            <Grid>
                    <DataGrid
                            IsReadOnly="True"
                            x:Name="dgAnzeigeWerk"
                            AutoGenerateColumns="false"
                            Margin="0,10,0,249" 
                            HeadersVisibility="Column"
                            RowHeight="25" HorizontalAlignment="Left" Width="492">

                        <DataGrid.Resources>
                            <Style TargetType="{x:Type DataGridRow}">
                                <EventSetter Event="Control.MouseDoubleClick" Handler="dgAnzeigeWerk_Row_DoubleClick"/>
                            </Style>
                        </DataGrid.Resources>

                        <DataGrid.Columns>
                            <DataGridTextColumn Width="auto" Header="Nummer" Binding="{Binding Kostenstellennummer}"/>
                            <DataGridTextColumn Width="auto" Header="Kostenstelle" Binding="{Binding Kostenstelle}"/>
                            <DataGridTextColumn Width="*" Header="Kosten" Binding="{Binding Kosten}"/>
                        </DataGrid.Columns>

                    </DataGrid>
                    <ComboBox x:Name="cbYearWerk" HorizontalAlignment="Left" Height="25" Margin="497,10,0,0" VerticalAlignment="Top" Width="98" VerticalContentAlignment="Center" SelectionChanged="cbYearWerk_SelectionChanged"/>
                    <Separator Height="15" Margin="0,-10,0,0" VerticalAlignment="Top"/>

                </Grid>
            </Grid>
        </TabItem>
...

To change the tabitem i use this code:

private void dgAnzeigeWerk_Row_DoubleClick(object sender, MouseButtonEventArgs e)
    {

        tabControl.SelectedItem = tiUebersicht;
    }

But the tab won't change. I tried to do the same code with a button and it worked. I also tried tabControl.SelectedIndex = 2 or tiUebersicht.IsSelected = true but without success.

Any suggestions?

Answer 1

Add e.Handled = true; to your handler at the end.

private void dgAnzeigeWerk_Row_DoubleClick(object sender, MouseButtonEventArgs e)
    {
        tabControl.SelectedItem = tiUebersicht;
        e.Handled = true;
    }

Actually selection is changing but its happening very fast and focus is returning back to the one containing DataGrid . This can be verified using SelectionChanged event of TabControl .

Answer 2

Try using Dispatcher inside of event.

Link to similar question

Dispatcher.InvokeAsync(() => tiUebersicht.IsSelected = true);
Dispatcher.Invoke(() => tiUebersicht.IsSelected = true);
Dispatcher.InvokeAsync(() => tabControl.SelectedItem = tiUebersicht);
Dispatcher.Invoke(() => tabControl.SelectedItem = tiUebersicht);