Hide
Try this:
Private Sub Check61_Click()
If Me.Check61 = True Then
Me.123.visible = True
Else
Me.123.visible = False
End If
End Sub
Instead of making the button visible or invisible you
may want to enable or disable it.
That way the user will know at any time there is a button to execute
an action:
Private Sub Check61_Click()
If Me.Check61 = True Then
Me.123.enabled = True
Else
Me.123.enabled = False
End If
End Sub
It is also good practice to use meaningful names,
so instead of 'Check61' something like: 'CheckOnOfButton123'.
When the program grows it will will be easier to find the right
code in case you need to modify or debug it.