VisualStateManager and nested controls

Hello people!

I'm trying to use VisualStateManager for a more consistent state change setup. My problem is, it doesn't seem to be able to recognize components that lie within other containers. Take for instance the following xaml:

            <StackLayout x:Name="CMD" Orientation="Horizontal"  BackgroundColor="Transparent"
                         Margin="0,0,5,0" IsEnabled="False">
                <VisualStateManager.VisualStateGroups>
                    <VisualStateGroup Name="CommonStates">
                        <VisualState Name="Disabled">
                            <VisualState.Setters>
                                <Setter TargetName="icon"
                                        Property="Label.TextColor"
                                        Value="{DynamicResource colors/disabled}" />
                                <Setter TargetName="text"
                                        Property="Label.TextColor"
                                        Value="{DynamicResource colors/disabled}" />
                            </VisualState.Setters>
                        </VisualState>
                    </VisualStateGroup>
                </VisualStateManager.VisualStateGroups>
                <Grid ColumnDefinitions="Auto,Auto,*">
                    <Label Grid.Column="0"
                                     WidthRequest="20"
                                     HeightRequest="20"
                                     Margin="0,0,10,0"
                                     Text="X"
                                     x:Name="icon" />
                    <Label Grid.Column="1"
                                  x:Name="text"
                                  Text="{Binding AddItemText}"
                                  TextColor="{DynamicResource colors/accent}"/>
                </Grid>
            </StackLayout>

This is just a representation of the original code, which contains custom controls - but the error is the same:

"InvalidOperationException: 'this element is not in a namescope'"

This only happens when the IsEnabled="False" property is set in the parent component.

In my real code, the enabled state is set based on a series of conditions, and when trying to set the IsEnabled property in code, I get a NullReferenceException in the Setter... presumably because it can't find the item in question.

Is this a known problem? Is there a solution to this?