CODEWITHSUNDEEP
wpftabitem
Oleg Sh
Oleg Sh

Reputation: 9013

IsSelected property of WPF TabItem

I have the following code:

<TabItem Name="tabItemGeneral">
    <TabItem.Triggers>
        <Trigger Property="IsSelected" Value="True">
            <Setter TargetName="tabGeneralImg" Property="Source" Value="Image/tabGeneralActive.png"></Setter>
        </Trigger>
    </TabItem.Triggers>
    <TabItem.Header>
        <StackPanel Orientation="Horizontal" Margin="0,-3,0,0">
            <Image Name="tabGeneralImg" Source="Images/tabGeneral.png" Width="11" Height="11"></Image>
            <Label Name="tabGeneralLbl" Content="General"></Label>
        </StackPanel>
    </TabItem.Header>
    <Grid>
        <!-- ... -->
    </Grid>
</TabItem>

but I get Error 1 'IsSelected' member is not valid because it does not have a qualifying type name. C:\MyNET\bluetooth\iLockWPF\iLock\iLock\MainWindow.xaml 63 60 iLock

during compilation. Why?

Upvotes: 7

Views: 11854

Answers (3)

Marat Khasanov
Marat Khasanov

Reputation: 3848

As CodeNaked said, it is unable to use property triggers directly on elements. You should use HeaderTemplate instead.

<TabControl>
    <TabControl.Resources>
        <DataTemplate x:Key="tabItemGeneralHeaderTemplate">
            <StackPanel Orientation="Horizontal" 
                        Margin="0,-3,0,0">
                <Image Name="tabGeneralImg" 
                       Source="Image/tabGeneralActive.png" 
                       Width="11" 
                       Height="11"/>
                <Label Name="tabGeneralLbl" 
                       Content="General"/>
            </StackPanel>
            <DataTemplate.Triggers>
                <DataTrigger Binding="{Binding Path=IsSelected
                                ,RelativeSource={RelativeSource TemplatedParent}}" 
                             Value="True">
                    <Setter TargetName="tabGeneralImg" 
                            Property="Source" 
                            Value="Images/tabGeneral.png"/>
                </DataTrigger>
            </DataTemplate.Triggers>
        </DataTemplate>
    </TabControl.Resources>
    <TabItem Name="tabItemGeneral" 
             HeaderTemplate="{StaticResource tabItemGeneralHeaderTemplate}">
        <Grid>
            ...
        </Grid>
    </TabItem>
</TabControl>

Upvotes: 9

CodeNaked
CodeNaked

Reputation: 41393

The TabItem.Triggers collection is inherited from FrameworkElement and can only contain EventTriggers. What you have is not valid.

Triggers, MultiTriggers, DataTriggers, and MultiDataTriggers can only be used in the Style.Triggers, ControlTemplate.Triggers, or DataTemplate.Triggers collections.

Upvotes: 4

Russell Troywest
Russell Troywest

Reputation: 8776

Do you need to use TabItem.IsSelected?

<Trigger Property="TabItem.IsSelected" Value="True">
  <Setter TargetName="tabGeneralImg" Property="Source" Value="Image/tabGeneralActive.png">
  </Setter>
</Trigger>

Upvotes: 0

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