listview in multitab
 

I have a userform.
the userform has a multitab.
the multitab(2 pages) has a listview.
and the listview has checkboxes.

but, the problem....
After checking listitems of listview, press the other page, and then if
I press the page again, the checkbox is disappeared....
why.......????
listview setting as follow....

with me.ListView1
.Gridlines = True
.FullRowSelect = True
.View = lvwReport
.LabelEdit = lvwManual
.HideSelection = False
.CheckBoxes = True
end with

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