In the following test case, when using the JavaFX SDK 1.2 partner binaries dated April 29, 2009:
(Note: This is same code as RT-4437)

package projavafx.metronometransition.ui;
import javafx.animation.Interpolator;
import javafx.animation.Timeline;
import javafx.animation.transition.TranslateTransition;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.shape.Circle;
import javafx.scene.layout.Flow;
import javafx.scene.paint.Color;
import javafx.stage.Stage;

var circle:Circle;
var anim = TranslateTransition {
  duration: 1s
  node: bind circle
  fromX: 0
  toX: 200
  interpolator: Interpolator.LINEAR
  autoReverse: true
  repeatCount: Timeline.INDEFINITE
};

Stage {
  title: "Metronome using TranslateTransition"
  width: 400
  height: 500
  visible: true
  scene: Scene {
    content: [
      circle = Circle {
        centerX: 100
        centerY: 50
        radius: 4
        fill: Color.BLUE
      },
      Flow {
        layoutX: 50
        layoutY: 420
        hGap: 10
        //hAlign: javafx.geometry.HPos.CENTER //TODO: Remove layoutX when this is available
        content: [
          Button {
            text: "Start"
            disable: bind anim.running
            action: function():Void {
              anim.playFromStart();
            }
          },
          Button {
            text: "Pause"
            disable: bind anim.paused or not anim.running
            action: function():Void {
              anim.pause();
            }
          },
          Button {
            text: "Resume"
            disable: bind not anim.paused
            action: function():Void {
              anim.play(); //TODO: This doesn't seem to be working
            }
          },
          Button {
            text: "Stop"
            disable: bind not anim.running
            action: function():Void {
              anim.stop();
            }
          }
        ]
      }
    ]
  }
}

Instead of having a grayed-out appearance, the Buttons that are disabled look normal, but don't have the rollover behavior that an enabled button has. After clicking the Start button, and then the Stop button, the disabled buttons take on a grayed-out appearance.

Thanks,
Jim Weaver