Cannot assign VisualStateGroup into property VisualStateGroups type must be assignable to ILISt

Question

I am setting VisualState to Button

<Style TargetType="Button">

<Setter Property="VisualStateManager.VisualStateGroups">

<VisualStateGroup x:Name="CommonStates">

</VisualStateGroup>

</Setter>

</Style>

Answer 1

This test with a ControlTemplate I had copied from the doc works for me :

               <ControlTemplate x:Key="RoundButton" TargetType="Button">
                <Grid>
                    <VisualStateManager.VisualStateGroups>
                        <VisualStateGroup x:Name="CommonStates">
                            <VisualState x:Name="Normal">
                                <Storyboard>
                                    <ColorAnimation Storyboard.TargetName="backgroundElement" 
                            Storyboard.TargetProperty="(Shape.Fill).(SolidColorBrush.Color)"
                            To="{TemplateBinding Background}"
                            Duration="0:0:0.3"/>
                                </Storyboard>
                            </VisualState>
                            <VisualState x:Name="PointerOver">
                                <Storyboard>
                                    <ColorAnimation Storyboard.TargetName="backgroundElement" 
                            Storyboard.TargetProperty="(Shape.Fill).(SolidColorBrush.Color)" 
                            To="Yellow" 
                            Duration="0:0:0.3"/>
                                </Storyboard>
                            </VisualState>
                        </VisualStateGroup>
                    </VisualStateManager.VisualStateGroups>
                    <Ellipse x:Name="backgroundElement" Fill="{TemplateBinding Background}" Stroke="{TemplateBinding Foreground}" />
                    <ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center" />
                </Grid>            
            </ControlTemplate>

Then :

            <Button Template="{StaticResource RoundButton}" Width="100" Height=" 32" >Test Button</Button>

Test :