void TextLineObjectManager_OnListModified(object sender, TextLineObjectListModifiedEventArgs e)
{
if (e.Added)
CreateMarker(e.TextLineObject as ITextMarkerObject);
else
RemoveMarker(e.TextLineObject as ITextMarkerObject);
}
void MarkedTextLinesManager_OnListModified(object sender, TextLineObjectListModifiedEventArgs e)
{
BreakPointAddedRemoved(e.TextLineObject as Breakpoint, e.Added);
}