diff --git a/lib/ui/drawable.go b/lib/ui/drawable.go
deleted file mode 100644
index ef09451..0000000
--- a/lib/ui/drawable.go
+++ /dev/null
@@ -1,10 +0,0 @@
-package ui
-
-type Drawable interface {
-	// Called when this renderable should draw itself
-	Draw(ctx *Context)
-	// Specifies a function to call when this cell needs to be redrawn
-	OnInvalidate(callback func(d Drawable))
-	// Invalidates the drawable
-	Invalidate()
-}
diff --git a/lib/ui/interactive.go b/lib/ui/interactive.go
deleted file mode 100644
index 2d4f099..0000000
--- a/lib/ui/interactive.go
+++ /dev/null
@@ -1,20 +0,0 @@
-package ui
-
-import (
-	"github.com/gdamore/tcell"
-)
-
-type Interactive interface {
-	// Returns true if the event was handled by this component
-	Event(event tcell.Event) bool
-}
-
-type Simulator interface {
-	// Queues up the given input events for simulation
-	Simulate(events []tcell.Event)
-}
-
-type DrawableInteractive interface {
-	Drawable
-	Interactive
-}
diff --git a/lib/ui/interfaces.go b/lib/ui/interfaces.go
new file mode 100644
index 0000000..320183f
--- /dev/null
+++ b/lib/ui/interfaces.go
@@ -0,0 +1,42 @@
+package ui
+
+import (
+	"github.com/gdamore/tcell"
+)
+
+type Drawable interface {
+	// Called when this renderable should draw itself
+	Draw(ctx *Context)
+	// Specifies a function to call when this cell needs to be redrawn
+	OnInvalidate(callback func(d Drawable))
+	// Invalidates the drawable
+	Invalidate()
+}
+
+type Interactive interface {
+	// Returns true if the event was handled by this component
+	Event(event tcell.Event) bool
+}
+
+type Simulator interface {
+	// Queues up the given input events for simulation
+	Simulate(events []tcell.Event)
+}
+
+type DrawableInteractive interface {
+	Drawable
+	Interactive
+}
+
+// A drawable which contains other drawables
+type Container interface {
+	Drawable
+	// A list of all drawables which are children of this one (do not recurse
+	// into your grandchildren).
+	Children() []Drawable
+	// Return the "focused" child, or none of no preference. Does not actually
+	// have to be Interactive. If there is a preferred child, input events will
+	// be directed to it. If there's no preference, events will be delivered to
+	// all children.
+	InteractiveChild() Drawable
+}