diff --git a/src/as/com/threerings/flex/PopUpUtil.as b/src/as/com/threerings/flex/PopUpUtil.as
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+//
+// $Id$
+
+package com.threerings.flex {
+
+import flash.geom.Point;
+import flash.geom.Rectangle;
+
+import mx.core.UIComponent;
+
+import com.threerings.flash.DisplayUtil;
+
+/**
+ * Flex popup utilities.
+ */
+public class PopUpUtil
+{
+    /**
+     * Center the popup inside the stage, to which it should already be added.
+     */
+    public static function center (popup :UIComponent) :void
+    {
+        centerInRect(popup, createStageRect(popup));
+    }
+
+    /**
+     * Center the popup within the specified rectangle.
+     */
+    public static function centerInRect (popup :UIComponent, rect :Rectangle) :void
+    {
+        var p :Point = DisplayUtil.centerRectInRect(new Rectangle(0, 0,
+            popup.getExplicitOrMeasuredWidth(), popup.getExplicitOrMeasuredHeight()), rect);
+        popup.x = p.x;
+        popup.y = p.y;
+    }
+
+    /**
+     * Fit the popup inside the stage.
+     */
+    public static function fit (popup :UIComponent) :void
+    {
+        fitInRect(popup, createStageRect(popup));
+    }
+
+    /**
+     * Fit the popup inside the specified rectangle.
+     */
+    public static function fitInRect (popup :UIComponent, rect :Rectangle) :void
+    {
+        var p :Point = DisplayUtil.fitRectInRect(new Rectangle(popup.x, popup.y,
+            popup.getExplicitOrMeasuredWidth(), popup.getExplicitOrMeasuredHeight()), rect);
+        popup.x = p.x;
+        popup.y = p.y;
+    }
+
+    /**
+     * Wee utility method.
+     */
+    protected static function createStageRect (popup :UIComponent) :Rectangle
+    {
+        return new Rectangle(0, 0, popup.stage.stageWidth, popup.stage.stageHeight);
+    }
+}
+}