Value 

Meaning 

ooDrawTreeRoot  

The first item (Index value of 1) is connected to the root item by the outline tree. This means that the tree will extend from the top of the outline to all the first level items. Without ooDrawTreeRoot, all first level items appear leftmost in the outline, not connected by the tree.  

ooDrawFocusRect  

The outline draws a focus rectangle around the selected item.  

ooStretchBitmaps  

The outline stretches the standard bitmaps (PictureLeaf, PictureOpen, PictureClosed, PicturePlus, PictureMinus) to fit in the size of the item, determined by the size of the Font of the Text. Without ooStretchBitmaps, the bitmaps will be cropped if larger than the height of the item text, or won't fill up the entire item space if smaller than the text.