diff --git a/readme.md b/readme.md
index c68cb34..7059a84 100644
--- a/readme.md
+++ b/readme.md
@@ -266,22 +266,23 @@ Built-in interpolation modifiers:
 ```nim
 - Layout():
   h = 720
-  spacing = 10
-  wrapSpacing = 20
+  gap = 10
+  wrapGap = 20
   orientation = vertical
+  hugContent = false
   wrapHugContent = true
   fillWithSpaces = true
   consistentSpacing = true
   wrap = true
   elementsBeforeWrap = 3
-  this.binding lengthBeforeWrap: this.w[]
+  lengthBeforeWrap := this.w[]
 
   - UiRect():
     w = 20
     h = 30
   
   - InLayout():
-    alignment = center
+    align = center
 
     - UiRect():
       w = 10
@@ -295,13 +296,13 @@ Built-in interpolation modifiers:
 ## makeLayout
 ```nim
 type
-  MyLayout = ref object of Uiobj
+  MyComponent = ref object of Uiobj
     changableChild: CustomProperty[UiRect]
 
-registerComponent MyLayout
+registerComponent MyComponent
 
 
-let x = MyLayout()
+let x = MyComponent()
 x.makeLayout:
   - UiRect():
     this.fill parent
@@ -317,6 +318,41 @@ x.makeLayout:
         this.fill(parent, 2, 4)
 ```
 
+### changable childs
+Changable childs could be used to re-build component tree on any event.
+```nim
+# ...in makeLaout macro...
+
+var elements = ["first", "second"]
+var elementsObj: CustomProperty[Layout]
+
+elementsObj --- Layout():
+  orientation = vertical
+  gap = 10
+
+  for i, element in elements:
+    - TextArea():
+      text = element
+
+      this.text.changed.connectTo this:
+        elements[i] = this.text[]
+  
+  - InLayout():
+    fillContainer = true
+
+    - MouseArea():
+      h = 20
+
+      this.mouseDownAndUpInside.connectTo this:
+        elements.add "new"
+        elementsObj[] = Layout()  # re-build tree
+
+      - UiText():
+        this.centerIn parent
+        text = "+"
+```
+
+
 ## Anchors
 ![image](http://levovix.ru:8000/docs/sigui/anchors%20example.png)
 *centering component is `this.centerIn parent`*
diff --git a/src/sigui/layouts.nim b/src/sigui/layouts.nim
index 24c0726..a74d490 100644
--- a/src/sigui/layouts.nim
+++ b/src/sigui/layouts.nim
@@ -178,7 +178,7 @@ proc reposition(this: Layout) =
     if this.childs.len > 0:
       this.set_h(rows[^1].childs.mapit(it.get_y + it.get_h).foldl(max(a, b), 0'f32))
     else:
-      this.set_w(0)
+      this.set_h(0)
 
 
 template spacing*(this: Layout): Property[float32] = this.gap