diff --git a/crates/ui-egui/src/panels/project.rs b/crates/ui-egui/src/panels/project.rs
index 8f249b780..21f842976 100644
--- a/crates/ui-egui/src/panels/project.rs
+++ b/crates/ui-egui/src/panels/project.rs
@@ -599,12 +599,10 @@ pub fn show(app: &mut EffectcraftApp, ui: &mut egui::Ui, rect: Rect) {
                 actions.push(("layer.addItem".into(), json!({"item": id.0})));
                 ui.close();
             }
+            // File ▸ New Comp from Selection on the selection (the right-clicked row joins it
+            // above): several items ask how in its dialog, as in After Effects (#360).
             if ui.button(crate::i18n::tr("New Comp from Selection")).clicked() {
-                if let Some((w, h)) = it.dimensions() {
-                    let d = it.duration().map(|d| d.seconds()).unwrap_or(10.0);
-                    actions.push(("comp.new".into(), json!({"name": format!("{} Comp", it.name), "width": w, "height": h, "duration": d})));
-                    actions.push(("layer.addItem".into(), json!({"item": id.0})));
-                }
+                actions.push(("file.newCompFromSelection".into(), json!({})));
                 ui.close();
             }
             ui.separator();
diff --git a/crates/ui-egui/tests/ui_project_rows.rs b/crates/ui-egui/tests/ui_project_rows.rs
index 43daf2ed1..4c255cadd 100644
--- a/crates/ui-egui/tests/ui_project_rows.rs
+++ b/crates/ui-egui/tests/ui_project_rows.rs
@@ -148,6 +148,32 @@ fn footage_context_menu_interprets_the_footage() {
     assert_eq!(h.state().dialog, Some(Dialog::Form), "the Interpret Footage dialog opened");
 }
 
+/// #360: the row menu's New Comp from Selection works on the whole selection, as File ▸ New
+/// Comp from Selection does: with several items selected it asks how in After Effects' New
+/// Composition from Selection dialog, and Multiple Compositions makes one per item.
+#[test]
+fn context_menu_new_comp_from_selection_uses_the_selection() {
+    let (mut h, _, comp, solid) = harness();
+    h.state_mut().session.state.project_selection = vec![comp, solid];
+    h.run_steps(2);
+    let at = center(&h, &format!("project.item.{}.name", solid.0));
+    h.input_mut().events.push(Event::PointerMoved(at));
+    h.step();
+    for pressed in [true, false] {
+        h.input_mut().events.push(Event::PointerButton { pos: at, button: egui::PointerButton::Secondary, pressed, modifiers: Modifiers::NONE });
+        h.step();
+    }
+    h.run_steps(2);
+    assert_eq!(h.state().session.state.project_selection, vec![comp, solid], "the selection stays");
+    let item = h.query_by_label_contains("New Comp from Selection").expect("in the menu").rect();
+    click_at(&mut h, item.center());
+    assert_eq!(h.state().dialog, Some(Dialog::Form));
+    assert!(h.state().auto.find("form.field.single").is_some(), "the New Composition from Selection dialog");
+    let comps = h.state().session.project.comps().count();
+    h.state_mut().session.execute_checked("file.newCompFromSelection", json!({"single": false})).unwrap();
+    assert_eq!(h.state().session.project.comps().count(), comps + 2, "one per item");
+}
+
 /// Dragging from the Project panel's empty area draws a selection box that selects the rows it
 /// touches; a click there deselects (#203).
 #[test]