Added selectable container that can be focused with keyboard shortcut.

components/selectable_container.tscn

@@ -0,0 +1,54 @@
+[gd_scene format=3 uid="uid://s7f003dyd60i"]
+
+[ext_resource type="Script" uid="uid://cxerh1gbkrop2" path="res://scripts/selectable_container.gd" id="1_focus"]
+
+[sub_resource type="LabelSettings" id="LabelSettings_0fpm5"]
+font_size = 24
+
+[node name="SelectableContainer" type="MarginContainer" unique_id=903061831]
+anchors_preset = -1
+anchor_right = 1.0
+anchor_bottom = 1.0
+offset_left = 4.0
+offset_top = 4.0
+offset_right = -4.0
+offset_bottom = -4.0
+grow_horizontal = 2
+grow_vertical = 2
+script = ExtResource("1_focus")
+
+[node name="PanelContainer" type="PanelContainer" parent="." unique_id=555833581]
+layout_mode = 2
+
+[node name="MarginContainer" type="MarginContainer" parent="." unique_id=701103853]
+layout_mode = 2
+theme_override_constants/margin_left = 16
+theme_override_constants/margin_top = 16
+theme_override_constants/margin_right = 16
+theme_override_constants/margin_bottom = 16
+
+[node name="VBoxContainer" type="VBoxContainer" parent="MarginContainer" unique_id=1200250605]
+layout_mode = 2
+
+[node name="HBoxContainer" type="HBoxContainer" parent="MarginContainer/VBoxContainer" unique_id=157590431]
+layout_mode = 2
+size_flags_vertical = 0
+
+[node name="Label" type="Label" parent="MarginContainer/VBoxContainer/HBoxContainer" unique_id=1765103253]
+layout_mode = 2
+size_flags_horizontal = 0
+size_flags_vertical = 1
+text = "Panel"
+label_settings = SubResource("LabelSettings_0fpm5")
+
+[node name="Button" type="Button" parent="MarginContainer/VBoxContainer/HBoxContainer" unique_id=519793654]
+layout_mode = 2
+size_flags_horizontal = 10
+text = "F1"
+
+[node name="HSeparator" type="HSeparator" parent="MarginContainer/VBoxContainer" unique_id=1046926303]
+layout_mode = 2
+
+[node name="Content" type="VBoxContainer" parent="MarginContainer/VBoxContainer" unique_id=1706387279]
+layout_mode = 2
+size_flags_vertical = 3