B4J Question [BANano] [SOLVED] How to successfully set styles starting with '--' using BANanoElement.SetStyle?

Sub SetVariable(el As BANanoElement, var As String, value As Object)
    el.GetField("style").RunMethod("setProperty", Array(var, value))
End Sub

Sub GetVariable(el As BANanoElement, var As String) As Object
    Dim computed As BANanoObject
    computed.Initialize4("getComputedStyle", el.ToObject) ' note that computed is read-only!
    Return computed.RunMethod("getPropertyValue", var)
End Sub

Sub RemoveVariable(el As BANanoElement, var As String)
    el.GetField("style").RunMethod("removeProperty", var)
End Sub

' get the body tag
Dim body As BANanoElement
body.Initialize("body")
' set    
SetVariable(body, "--value", "70")
' get    
Log(GetVariable(body, "--value")) ' returns 70
' remove    
RemoveVariable(body, "--value")
' get again    
Log(GetVariable(body, "--value")) ' returns empty