Wpf Combobox selectedvalue trigger

I am trying to change the visibility with a trigger when a particular value in a combobox is selected, and I got the following XAML

 <ItemsControl ItemsSource="{Binding AccessControl.Credentials}" >
                        <ItemsControl.ItemTemplate>
                        <DataTemplate>                              
                            <Grid  >                                  

                             <ComboBox  Name="chkFieldType"                                          
                                        SelectedValue="{Binding Path=ValueSourceType,Converter={StaticResource enumstringConv}}"
                                        SelectedValuePath="Tag" SelectionChanged="chkFieldType_SelectionChanged" >
                              开发者_开发问答             <ComboBoxItem Tag="User">User</ComboBoxItem>                                     
                                           <ComboBoxItem Tag="SessionCredential">Field</ComboBoxItem>
                                           <ComboBoxItem Tag="Inherit">From other Resource</ComboBoxItem>
                             </ComboBox>


                                    <Border " Visibility="Hidden">
                                        <Border.Resources>
                                            <Style TargetType="{x:Type Border}">
                                                <Style.Triggers>
                                                    <DataTrigger Binding="{Binding Path=SelectedValue, ElementName=chkFieldType}" Value="Inherit">
                                                        <Setter Property="Visibility" Value="Visible" />
                                                    </DataTrigger>
                                                </Style.Triggers>
                                            </Style>
                                        </Border.Resources>
                                        <ComboBox/>                                         
                                    </Border>

In this case a border. The selected value is "Inherit" of type string but the border remainds hidden.

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I ran into the same problem and found that you have to set the visibility property using the style only. So instead of having the initial visibility set with:

<Border Visibility="Hidden">

You should set the initial visibility using the style:

<Style TargetType="....">
   <Setter Property="Visibility" Value="Hidden"/>
   <Style.Triggers>
      ....
   </Style.Triggers>
</Style>

(I know it's kinda overdue but I thought maybe someone else might run into the same problem).

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Try SelectedItem.Tag or SelectedItem.Content instead of SelectedValue

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Set your binding on SelectedValue, not SelectedItem.SelectedValue. The way you currently have it, it is looking for ComboBoxItem.SelectedValue, which doesn't exist

<DataTrigger Value="Inherit" 
             Binding="{Binding Path=SelectedValue,
                               Converter={StaticResource enumstringConv}, 
                               ElementName=chkFieldType}">

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I think it's because you are putting the DataTrigger in Border.Resources. Try putting the style in the window.resources, with a x:key in order to apply the style to the border.

I think that the border.resources can not access to a control "outside it's own resources context"

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SelectedItem and SelectedValue are two seperate properties on the ComboBox. Since your ComboBoxItems are all strings you can change
<DataTrigger Binding="{Binding Path=SelectedItem.SelectedValue, ElementName=chkFieldType}" Value="Inherit">
to
<DataTrigger Binding="{Binding Path=SelectedItem, ElementName=chkFieldType}" Value="Inherit">

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I ended up setting the visibility manually via the code behind when the selectedItem event is fired..