I'm not sure what you're doing, but here's some code that I've used to add
checkboxes from the Forms toolbar to a range of cells in a worksheet:
Option Explicit
Sub testme()
Dim myCBX As CheckBox
Dim myCell As Range
With ActiveSheet
.CheckBoxes.Delete 'nice for testing
For Each myCell In .Range("B3:B10").Cells
With myCell
Set myCBX = .Parent.CheckBoxes.Add _
(Top:=.Top, Width:=.Width, _
Left:=.Left, Height:=.Height)
With myCBX
.LinkedCell = myCell.Address(external:=True)
.Caption = ""
.Name = "CBX_" & myCell.Address(0, 0)
.OnAction = "'" & ThisWorkbook.Name & "'!dothework"
End With
.NumberFormat = ";;;"
End With
Next myCell
End With
End Sub
Sub DoTheWork()
Dim myCBX As CheckBox
Set myCBX = ActiveSheet.CheckBoxes(Application.Caller)
If myCBX = xlOn Then
'do something
Else
'do something else
End If
End Sub