Use ItemBold, ItemItalic, ItemUnderline or ItemStrikeOut property to apply different font attributes to the item. Use the CellItalic, CellUnderline, CellBold or CellStrikeOut property to apply different font attributes to the cell. Use the CellCaptionFormat property to specify an HTML caption. Use the ConditionalFormats method to apply formats to a cell or range of cells, and have that formatting change depending on the value of the cell or the value of a formula.

The following VB sample underlines the selected item:

Private Sub Tree1_SelectionChanged()
    If Not (h = 0) Then Tree1.Items.ItemUnderline(h) = False
    h = Tree1.Items.SelectedItem()
    Tree1.Items.ItemUnderline(h) = True
End Sub

The following VB sample underlines the focused item:

With Tree1.Items
    .ItemUnderline(.FocusItem) = True
End With

The following C++ sample underlines the focused item:

#include "Items.h"
CItems items = m_tree.GetItems();
items.SetItemUnderline( items.GetFocusItem() , TRUE );

The following C# sample underlines the focused item:

axTree1.Items.set_ItemUnderline(axTree1.Items.FocusItem, true);

The following VB.NET sample underlines the focused item:

With AxTree1.Items
    .ItemUnderline(.FocusItem) = True
End With

The following VFP sample underlines the focused item:

with thisform.Tree1.Items
	.DefaultItem = .FocusItem
	.ItemUnderline( 0 ) = .t.
endwith