Left
Right
Center
On non-AmigaOS systems this attribute is only supported for the dataview
backend. When creating a treeview and Treeviewcolumn.Align is
set to a value other than Left, RapaGUI will automatically switch to the
dataview backend. If you don't specify this attribute at creation time
but want to set it later using moai.Set(), you have to
explicitly request a dataview widget by setting the Treeview.ForceMode
attribute.