diff --git a/examples/ui/ui.v b/examples/ui/ui.v
index 8e203ac..59e167e 100644
--- a/examples/ui/ui.v
+++ b/examples/ui/ui.v
@@ -121,7 +121,7 @@ pub fn (mut a App) init() ! {
 					},
 				]
 			},
-		/*
+			/*
 			&ui.PointerEventArea{
 				id: 100
 				x: 50
diff --git a/ui/item.v b/ui/item.v
index e95d224..87a0187 100644
--- a/ui/item.v
+++ b/ui/item.v
@@ -52,9 +52,9 @@ pub fn (i &Item) event(e Event) ?&Node {
 	}
 	for on_event in i.on_event {
 		assert !isnil(on_event)
-		// If `on_event` returns true, it means
-		// a listener on *this* item has accepted the event
 		if on_event(i, e) {
+			// If `on_event` returns true, it means
+			// a listener on *this* item has accepted the event
 			return i
 		}
 	}
@@ -164,9 +164,28 @@ pub fn (pea &PointerEventArea) event(e Event) ?&Node {
 				y: ey
 			}
 
-			// If `on_pointer_event` returns true, it means
-			// a listener on *this* item has accepted the event
+			// TODO BUG pea pointer address is not the same in userspace callbacks?!
+			/*
+			eprintln('${@STRUCT}.${@FN} ea: ${ptr_str(pea.EventArea)}')
+			eprintln('${@STRUCT}.${@FN} ea.this: ${ptr_str(pea.EventArea.this)}')
+			eprintln('${@STRUCT}.${@FN} pea: ${ptr_str(pea)}')
+			eprintln('${@STRUCT}.${@FN} id: ${pea.id}')
+			eprintln('${@STRUCT}.${@FN} this: ${ptr_str(pea.this)}')
+
+			//unsafe { pea.this = pea }
+			//if on_pointer_event(pea.EventArea, pe) {
+			mut copy := &PointerEventArea{...pea}
+			unsafe { copy.this = copy }
+			eprintln('${@STRUCT}.${@FN} copy ea: ${ptr_str(copy.EventArea)}')
+			eprintln('${@STRUCT}.${@FN} copy ea.this: ${ptr_str(copy.EventArea.this)}')
+			eprintln('${@STRUCT}.${@FN} copy pea: ${ptr_str(copy)}')
+			eprintln('${@STRUCT}.${@FN} copy id: ${copy.id}')
+			eprintln('${@STRUCT}.${@FN} copy this: ${ptr_str(copy.this)}')
+			*/
+
 			if on_pointer_event(pea, pe) {
+				// If `on_pointer_event` returns true, it means
+				// a listener on *this* item has accepted the event
 				return pea
 			}
 		}
diff --git a/ui/node.v b/ui/node.v
index a581ed3..f44e683 100644
--- a/ui/node.v
+++ b/ui/node.v
@@ -31,7 +31,7 @@ pub fn (n &Node) collect(mut nodes []&Node, filter fn (n &Node) bool) {
 // modify visits all `Node`s in a Breath-First search (BFS),
 // calling `func` with each `Node` as an argument.
 pub fn (n &Node) modify(func fn (mut n Node)) {
-	assert n != unsafe { nil }
+	assert n != unsafe { nil }, 'Node is null'
 	mut mn := unsafe { n }
 	func(mut mn)
 	for mut node in mn.body {
diff --git a/ui/ui.v b/ui/ui.v
index e980714..812a727 100644
--- a/ui/ui.v
+++ b/ui/ui.v
@@ -45,7 +45,7 @@ mut:
 // init initializes the UI.
 fn (mut u UI) init() ! {
 	u.root.parent = shy.null
-
+	eprintln('[WIP] UI module is still subject to change, use at own risk :)')
 	// Traverse the tree, root to leaves, set all `parent` fields.
 	u.modify(fn (mut n Node) {
 		for mut node in n.body {
@@ -141,6 +141,7 @@ pub fn (u &UI) draw(dt f64) {
 	unsafe {
 		u.dt = dt
 	}
+	// TODO surround in a separate render pass?
 	u.root.draw(u)
 }