public Style ResourceStyle { get; set; }

Public Property ResourceStyle As Style

<dxgn:GanttControl ItemsSource="{Binding Tasks}">
    <dxgn:GanttControl.View>
        <dxgn:GanttView ResourcesSource="{Binding Resources}">
            <dxgn:GanttView.ResourceStyle>
                <Style TargetType="{x:Type dxgn:GanttResourceControl}">
                    <Setter Property="Background" Value="{Binding ResourceData.Color, 
                                                  Converter={dxmvvm:ColorToBrushConverter}}"/>
                    <Setter Property="CornerRadius" Value="0"/>
                    <Setter Property="Foreground" Value="White"/>
                    <Setter Property="BorderThickness" Value="0"/>
                    <Style.Triggers>
                        <EventTrigger RoutedEvent="MouseEnter">
                            <BeginStoryboard>
                                <Storyboard>
                                    <DoubleAnimation Duration="0:0:0.2" From="1" To="0.35" 
                                                     Storyboard.TargetProperty="Opacity"/>
                                </Storyboard>
                            </BeginStoryboard>
                        </EventTrigger>
                        <EventTrigger RoutedEvent="MouseLeave">
                            <BeginStoryboard>
                                <Storyboard>
                                    <DoubleAnimation Duration="0:0:0.2" From="0.35" To="1" 
                                                     Storyboard.TargetProperty="Opacity"/>
                                </Storyboard>
                            </BeginStoryboard>
                        </EventTrigger>
                    </Style.Triggers>
                </Style>
            </dxgn:GanttView.ResourceStyle>
        </dxgn:GanttView>
    </dxgn:GanttControl.View>
</dxgn:GanttControl>