Automatically refresh mounting state of the device icons on pinboard?

Dear all:
I drag /media/sdb1 to pinboard, the icon (/media/sdb1) on pinboard has a
"small ball" on upper left corner which means the device /media/sdb1 is
mounted.

If I umount /media/sdb1, the "small ball" of icon on pinboard will not
disappear unless I move the mouse over the icon.

Do you know how to make the device icon on pinboard automatically refresh
it's mounting state?

Thanks a lot~

Best Regards,
Minhsien

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