DataContext is Not Accesible so the Binding is not happening i guess

Question

   <Grid>
      <CheckBox  Content="Select All" IsChecked="{Binding Path=SelectAll}"/>
      <TextBlock Grid.Column="1" Text="Filter by:"  />
      <RadioButton IsChecked="{Binding Path=All}" GroupName="filterGroup" Content="All" />
      <RadioButton IsChecked="{Binding Path=NShared}" GroupName="filterGroup" Content="Not Shared" />
   </Grid>
   <GroupBox Header="Members" Style="{StaticResource CenteredHeaderGroupBoxStyle}" Width="330">
      <GroupBox.HeaderTemplate>
           <DataTemplate>
                <Border Width="320">
                    <Grid HorizontalAlignment="Center" Width="320">
                       <ToggleButton Name="LeftButton" Command="{Binding Path=MemeberButtonSelected}"/>
                       <ToggleButton Name="RightButton" IsChecked="{Binding Path=GroupSelected}"/>
                     </Grid>
                 </Border>
            </DataTemplate>
       </GroupBox.HeaderTemplate>
       <GroupItem>
          <Border>
            <ListBox Name="GroupMemberList">
                <ListBox.Style>
                    <Style>
                       <Style.Triggers>
                           <DataTrigger Binding="{Binding Path=GroupSelected}" Value="True">
                                <Setter Property="ListBox.ItemsSource" Value="{Binding Path=GroupsoftheCase}"/>
                                <Setter Property="ListBox.ItemTemplate" Value="{StaticResource GroupListTemplate}"/>
                                <Setter Property="ListBox.SelectedValue" Value="{Binding Path=SelectedGroups}"/>
                            </DataTrigger>
                            <DataTrigger Binding="{Binding Path=MemberSelected}" Value="True">
                                <Setter Property="ListBox.ItemsSource" Value="{Binding Path=MembersoftheCase}"/>
                                <Setter Property="ListBox.ItemTemplate" Value="{StaticResource MembersListTemplate}"/>
                                <Setter Property="ListBox.SelectedValue" Value="{Binding Path=SelectedMembers}"/>
                            </DataTrigger>
                       </Style.Triggers>
                    </Style>
                </ListBox.Style>
             </ListBox>
          </Border>
       </GroupItem>
   </GroupBox>

The ToggleButton Binding is Not working the Properties/Commands are existing in the DataContext of the View

but the output says

System.Windows.Data Error: 40 : BindingExpression path error: 'MemeberButtonSelected' property not found on 'object' ''String' (HashCode=-1399923548)'. BindingExpression:Path=MemeberButtonSelected; DataItem='String' (HashCode=-1399923548); target element is 'ToggleButton' (Name=''); target property is 'Command' (type 'ICommand')

System.Windows.Data Error: 40 : BindingExpression path error: 'GroupSelected' property not found on 'object' ''String' (HashCode=-1399923548)'. BindingExpression:Path=GroupSelected; DataItem='String' (HashCode=-1399923548); target element is 'ToggleButton' (Name=''); target property is 'IsChecked' (type 'Nullable`1')

i have also tried the Relative Source

as

 IsChecked="{Binding Path=MemberSelected, RelativeSource={RelativeSource AncestorType={x:Type GroupBox}}}"

for one of the Toggle buttons and its of no Use only the String in the output will change to object thats all

Are you sure there are no typos? MemeberButtonSelected looks like a typo. Also, in the relative path example, you called it MemberSelected. — Daniel Hilgarth

Thomas Levesque Thomas Levesque · Accepted Answer · 2011-05-31T14:47:13

The Header of your GroupBox is a string ("Members"), so the DataContext in the HeaderTemplate is also a string... and there is no MemeberButtonSelected property on type String, as mentioned in the error message. You need to bind to the DataContext of the GroupBox:

...
<Grid HorizontalAlignment="Center" Width="320">
   <ToggleButton Name="LeftButton" Command="{Binding Path=DataContext.MemeberButtonSelected, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type GroupBox}}}"/>
   <ToggleButton Name="RightButton" IsChecked="{Binding Path=DataContext.GroupSelected, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type GroupBox}}}"/>
 </Grid>
...

DataContext is Not Accesible so the Binding is not happening i guess

2 Answers