Custom Ribbon Toggle Button, how do I change state with VBA?

I have a Toggle button that activates code that changes the fill color of the sheet. I want to send up a message box warning the user before it erases the fill in all their cells and if they hit cancel then the code should set the toggle button state back to unclicked and exit the sub. I cant figure out how to set the toggle button state, here is my code:

Public fFillBehavior As Boolean
Sub btnFocusFill_Click(control As IRibbonControl, pressed As Boolean)
    fFillBehavior = pressed
    
    If pressed Then
        If MsgBox("This will remove the fill color of all your cells, do you still want to continue?", vbOKCancel) = vbOK Then
            fillEnable
        Else
            ' ENTER CODE TO CHANGE BUTTON STATE TO UNCLICKED
            Exit Sub
        End If
    Else
        fillDisable
    End If
End Sub

Any help is appreciated
Thank you.