Right to Left ????

hi
how do set right to left listbox with markup mode?
if set true in rightoleft properties with markup = true , we have not listbox`s right to left. example:

ListBoxMarkup.AddItem "<Border BorderThickness='2' BorderBrush='Orange' Margin='0, 2, 0, 2' Padding='3'><StackPanel Orientation='Horizontal'>" & _
    "<Image Source='10'/>" & _
    "<Grid><Grid.ColumnDefinitions><ColumnDefinition Width='Auto'/><ColumnDefinition Width='*'/></Grid.ColumnDefinitions>" & _
    "<Grid.RowDefinitions><RowDefinition/><RowDefinition/></Grid.RowDefinitions>" & _
    "<TextBlock TextAlignment='Right' FontWeight='Bold' Foreground='Navy' Text='Description:'/>" & _
    "<TextBlock TextAlignment='Right' Grid.Row='1' FontWeight='Bold' Foreground='Navy' Text='Current Price:'/>" & _
    "<TextBlock Margin='6, 0, 0, 0' Grid.Column='1' Text='Snowboard and bindings'/>" & _
    "<TextBlock Margin='6, 0, 0, 0'  Grid.Column='1' Grid.Row='1'  Text='$150'/>" & _
    "</Grid></StackPanel></Border>"

with listbox:  right to left = true and enablemarkup = true.
me have not righttoleft listbox.
how to salved this problem????