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diff --git a/prev/proposals/sidebar.md b/prev/proposals/sidebar.md
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+# Sidebar Control
+
+```go
+type Sidebar interface {
+	Control
+
+	AppendCategory(text string)
+	DeleteCategory(index int)
+
+	AppendItem(category int, name string)
+	DeleteItem(category int, index int)
+
+	Selection() (category int, index int)		// or Selected()?
+	Select(category int, index int)
+
+	OnSelected(func())
+}
+```
+
+Simple two-level sidebars.
+
+Could have images on each item in the future.
+
+## Mac OS X
+Source List NSTableView (need to see how this will work)
+
+## GTK+
+GTK_STYLE_CLASS_SIDEBAR (available in 3.4); see how GtkPlacesSidebar implements this
+	- other programs that do: Rhythmbox
+
+## Windows
+????
diff --git a/prev/proposals/tree.md b/prev/proposals/tree.md
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+# Tree
+
+Unlike Table, Tree can only store a set of a single data type. (Blame Windows.)
+
+```go
+type TreeData struct {
+	Checked		bool
+	Image		ImageIndex
+	Text			string
+	Children		[]TreeData		// TODO does this need to be *[]TreeData?
+}
+```
+
+(the facilities for Images has yet to be designed)
+
+Tree itself will operate similarly to Table:
+
+```go
+type Tree struct {
+	Control
+	sync.Locker		// with Unlock() refreshing the view
+	Data() *[]TreeData
+	SetHasCheckboxes(bool)
+	SetHasImages(bool)
+}
+```
+
+By default, a Tree only shows the Text field.
+
+A Tree path is just an `[]int` with each element set to the consecutive index in Children. For example:
+
+```go
+i := []int{3, 4, 5}
+value := tree.Data()[i[0]].Children[i[1]].Children[i[2]].Text
+```