diff --git a/sample/src/android/widget/VerticalSeekBar.java b/sample/src/android/widget/VerticalSeekBar.java
index ddedff9..43c02f2 100644
--- a/sample/src/android/widget/VerticalSeekBar.java
+++ b/sample/src/android/widget/VerticalSeekBar.java
@@ -51,7 +51,6 @@ public boolean onTouchEvent(MotionEvent event) {
             	i=getMax() - (int) (getMax() * event.getY() / getHeight());
                 setProgress(i);
                 Log.i("Progress",getProgress()+"");
-                onSizeChanged(getWidth(), getHeight(), 0, 0);
                 break;
 
             case MotionEvent.ACTION_CANCEL:
@@ -59,5 +58,10 @@ public boolean onTouchEvent(MotionEvent event) {
         }
         return true;
     }
-    
+
+    @Override
+    public synchronized void setProgress(int progress) {
+        super.setProgress(progress);
+        onSizeChanged(getWidth(), getHeight(), 0, 0);
+    }
 }
\ No newline at end of file
diff --git a/sample/src/android/widget/VerticalSeekBar_Reverse.java b/sample/src/android/widget/VerticalSeekBar_Reverse.java
index 69dcfca..fb5619d 100644
--- a/sample/src/android/widget/VerticalSeekBar_Reverse.java
+++ b/sample/src/android/widget/VerticalSeekBar_Reverse.java
@@ -59,5 +59,11 @@ public boolean onTouchEvent(MotionEvent event) {
         }
         return true;
     }
+
+    @Override
+    public synchronized void setProgress(int progress) {
+        super.setProgress(progress);
+        onSizeChanged(getWidth(), getHeight(), 0, 0);
+    }
     
 }
\ No newline at end of file