diff --git a/Rs.Controls/RsTray.cs b/Rs.Controls/RsTray.cs
index 0b323bf..6e36976 100644
--- a/Rs.Controls/RsTray.cs
+++ b/Rs.Controls/RsTray.cs
@@ -413,15 +413,15 @@ namespace Rs.Controls
             else if (sortDir == ESortDir.RightTopToBottom)
             {
                 //从列开始画
-                for (int r = RowNum; r > 0; r--)
+                for (int c = ColumnNum; c > 0; c--)
                 {
-                    for (int c = 0; c < ColumnNum; c++)
+                    for (int r = 0; r < RowNum; r++)
                     {
                         index++;
                         if (traySlotsDic.ContainsKey(index))
                         {
-                            float x = slotWidth * r;
-                            float y = slotHeight * c;
+                            float x = slotWidth * (c-1);
+                            float y = slotHeight * r;
                             traySlotsDic[index].Bound = new RectangleF(x, y, (int)slotWidth - ColSpace, (int)slotHeight - RowSpace);
                         }
                     }