我有一个这样的屏幕：
+--------+---------------------+
|___A____| |
|________| JComponent I am |
|________| drawing on |
|________| __ __ |
|________| | | |
|________| |
|________| \__________/ |
|________| |
|________| |
|________| |
+--------+---------------------+
我想这样做，当我点击按钮A时，一个托盘会弹出我正在绘制的JComponent的顶部？如何最好地实现这一点？通过忽略布局管理器并将其添加到我用作画布或某种分层窗格的JComponent中？
+--------+---------------------+
|___A____|_Tray__| |
|________| JComponent I am |
|________| drawing on |
|________| __ __ |
|________| | | |
|________| |
|________| \__________/ |
|________| |
|________| |
|________| |
+--------+---------------------+
要掌握JPopupMenu与拟议托盘之间的区别。
+------+--------------------+
|Button|
+------+
| | <--- JPopupMenu
+------+
+------+--------------------+
|Button|____________| <----- Tray
+------+