public void AddBefore(ScriptLine newLine, ScriptLine destination)
{
if (destination == null || ScriptLines.IndexOf(destination) == -1)
{
destination = ScriptLines.Where(a => a.GetType() == typeof(Blank)).FirstOrDefault();
}
var index = ScriptLines.IndexOf(destination);
ScriptLines.Insert(index, newLine);
}
public void AddBeforeSelected(ScriptLine newLine)
{
AddBefore(newLine, SelectedLine);
}