how to make a menu shown even after clicking a checkboxmenu

i want to make a menu shown(in expand mode,user must press ESC or click somewhere to hide it) after clicking the jcheckboxmenuitem.
[138 byte] By [armia] at [2007-10-2 10:43:36]
# 1
please help me
armia at 2007-7-13 2:53:31 > top of Java-index,Desktop,Core GUI APIs...
# 2
Are trying to make PopupMenu or MenuBar?
mvpa at 2007-7-13 2:53:31 > top of Java-index,Desktop,Core GUI APIs...
# 3
In MenuBar,
armia at 2007-7-13 2:53:31 > top of Java-index,Desktop,Core GUI APIs...