将用户控件绑定到不会触发的contentcontrol验证规则

Question

I have many user controls and i have main window which contains a content control and list box when user select from list box i bound the selected user control to the content control the problem is when the user control bound for the first time the validation rules is appears but when user control bound for the second time the validation rules disappear what is the problem ? here is the main window :

<Grid>
    <ListBox x:Name="FormsListBox" Margin="0,5,0,5" Grid.Row="1" Grid.Column="0"  Width="180" ItemsSource="{Binding Formlist}" SelectedItem="{Binding SelectedFormInfo}">
        <ListBox.ItemTemplate>
            <DataTemplate>
                <StackPanel Orientation="Horizontal">
                    <Image Source="Resources/Capture.PNG" ></Image>
                    <TextBlock Text="{Binding Path=FormName}"></TextBlock>
                </StackPanel>
            </DataTemplate>
        </ListBox.ItemTemplate>
    </ListBox>
    <StackPanel Grid.Row="1"  Grid.Column="1" x:Name="MainStackPanel" >
        <ContentControl  Content="{Binding Path=SelectedFormInfo.MainForm}">

        </ContentControl>
    </StackPanel>
</Grid>

here is the sample of validation role in user control:

<StackPanel Width="315" Margin="20,0,10,0">
    <TextBox x:Name="TxtWeaponNumber" Width="315">
        <TextBox.Text>
            <Binding Path="SelectedWeapon.weaponNumber" Mode="TwoWay"
                UpdateSourceTrigger="PropertyChanged" ValidatesOnNotifyDataErrors="True"
                ValidatesOnDataErrors="True" NotifyOnValidationError="True"
                NotifyOnSourceUpdated="True" NotifyOnTargetUpdated="True">
                <Binding.ValidationRules>
                    <validationRules:RequiredRule ValidatesOnTargetUpdated="True" ValidationStep="RawProposedValue" />
                </Binding.ValidationRules>
            </Binding>
        </TextBox.Text>
    </TextBox>
</StackPanel>

Note: MainForm in SelectedFormInfo contains thee selected user control

Answer 1

我在AdornerDecorator中设置了用户控件，并且验证没有消失