为每个状态单独的图像使用依赖项财产的按钮

我有一个 Button 我希望能够在整个项目中重用的控件。每次按钮进入新状态时,将显示不同的图像。现在,我有 Normal State 和 Pressed State .

下面是控件的XAML部分:

<Button
    x:Class="customImageButton.ImageButton"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <Button.Template>
      <ControlTemplate TargetType="{x:Type Button}">
         <Grid>
            <ContentControl Width="80">
                <Grid>
                    <Image Name="Normal" Source="{Binding NormalState}"/>
                    <Image Name="Pressed" Source="{Binding PressedState}" Visibility="Hidden"/>
                </Grid>
            </ContentControl>
         </Grid>
         <ControlTemplate.Triggers>
            <Trigger Property="IsPressed" Value="True">
               <Setter TargetName="Normal" Property="Visibility" Value="Hidden"/>
               <Setter TargetName="Pressed" Property="Visibility" Value="Visible"/>
            </Trigger>
         </ControlTemplate.Triggers>
      </ControlTemplate>
   </Button.Template>
</Button>

下面是控件的代码:

namespace customImageButton
{
    public partial class ImageButton : Button
    {
        public ImageButton()
        {
            this.InitializeComponent();
        }

        public ImageSource NormalState
        {
            get { return base.GetValue(NormalStateProperty) as ImageSource; }
            set { base.SetValue(NormalStateProperty, value); }
        }

        public static readonly DependencyProperty NormalStateProperty =
            DependencyProperty.Register("NormalState", typeof(ImageSource), typeof(ImageButton));

        public ImageSource PressedState
        {
            get { return base.GetValue(PressedStateProperty) as ImageSource; }
            set { base.SetValue(PressedStateProperty, value); }
        }

        public static readonly DependencyProperty PressedStateProperty =
            DependencyProperty.Register("PressedState", typeof(ImageSource), typeof(ImageButton));
    }
}

…其用途如下:

<local:ImageButton Content="CustomButton" HorizontalAlignment="Left" 
                   VerticalAlignment="Top" NormalState="Resources/Normal.png"
                   PressedState="Resources/Pressed.png"/>

我的问题是我提供的图像无法显示。这个 Build Action 对于这两个图像 Resource 我尝试过使用绝对路径;然而,这提供了相同的结果。我错过了什么?