list box back key comes with information message

hi Md.Khalid Ahmad,

i have implemented a listbox in uiq, when i try to close the dialog which has the listbox, by clicking the back key button which lies on the right top corner, it shows a information message dialog with the content "cancelled" and a command button "continue"

i am not handling the back key button it been handled by default handlecommand,

when i handle the back key button and close the dialog, it is not showing that message dialog,

that information dialog is coming only when the back key is handled by the default handlecommand,

how to avoid that message without handling the back key

i hope it is clear, if not please me know

Thanks and regards,
jatboy