How to control the background opacity of progress dialog in Roku scene graph?

Archived
1

I am using main.brs code to show the progress loading dialog . If i use this code for progress dialog then its default background is occupying complete screen. here i want to show only progress loading animation and background should be little transparent. could anyone please help on this.
Main.brs
[/font][/size][/color]

ShowLoading = CreateObject("roSGScreen")
ShowLoading.CreateScene("ProgressDialogExample")
ShowLoading.show()

ProgressDialogExample.Xml

<component name = "ProgressDialogExample" extends = "Scene">

  <script type = "text/brightscript" >
    <![CDATA[
    sub init()
        progressdialog = createObject("roSGNode", "ProgressDialog")
        progressdialog.title = "Loading..."
        m.top.dialog = progressdialogs
        m.top.setFocus(true)
    end sub 
    ]]>
  </script>
</component>
2

For posterity, see answer by @RomanPodymov on SO