itk_component add menu {
menu $itk_interior.menu \
# -label "aa" \ wrong
-tearoff 0 \
-borderwidth 1
}
itk_component a class, add a subclass menu
itk_component do not have option "lable"
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$itk_component(menu) add cascade \
-label "Session" \
-menu $itk_component(sessionmenu)
$itk_component(menu) a menu class which has label option