How can i show icon of image manager in messagebar

Hi developers

I'm gooing to put icon in messagebar,but i coulden't do it yet. i took a look in sample code , but i didn't know how can i use icon such as this sample code, 

I used this code :

Dim MessageBar As MessageBar
Set MessageBar = CommandBars.MessageBar
MessageBar.Visible = True
MessageBar.Message = _
"<StackPanel Orientation='Horizontal'>" & _
" <Image Source='32988'/>" & _
" <TextBlock Padding='3, 0, 0, 0' VerticalAlignment='Center' ><Bold>Security Warning</Bold></TextBlock>" & _
" <TextBlock Padding='10, 0, 0, 0' VerticalAlignment='Center'>Certain content has been disabled.</TextBlock>" & _
"

i want to use icon in image manager and show it in messagebar

please show me how can i use icon of image manager and show this icon on messagebar

thank's all 

Hi again Xander75

thank you so much , your code help me to develope my prog.