diff --git a/example/app.tsx b/example/app.tsx
index 4d3d993..383000c 100644
--- a/example/app.tsx
+++ b/example/app.tsx
@@ -41,18 +41,6 @@ export default ()=>
                 <p>hello!</p>
                 <p>hello!</p>
                 <p>hello!</p>
-                <C.Group>
-                <C.Button></C.Button>
-                <C.Menu>
-                    <p>hello!</p>
-                    <p>hello!</p>
-                    <p>hello!</p>
-                    <p>hello!</p>
-                    <p>hello!</p>
-                    <p>hello!</p>
-                    <p>hello!</p>
-                </C.Menu>
-            </C.Group>
                 <p>hello!</p>
                 <p>hello!</p>
                 <p>hello!</p>
diff --git a/example/tree-menu.tsx b/example/tree-menu.tsx
index 8d15542..aad5246 100644
--- a/example/tree-menu.tsx
+++ b/example/tree-menu.tsx
@@ -17,19 +17,31 @@ export const Menu =(props:{children:React.JSX.Element|React.JSX.Element[]})=>
     const [stateGet, stateSet] = React.useContext(CTX);
     const refElement:React.MutableRefObject<HTMLElement|null> = React.useRef( null );
     const refControl:React.MutableRefObject<CollapseControls|null> = React.useRef( null );
-    
-    const classDefault = "relative transition-all duration-700 border";
-    const classOpen = "h-auto w-auto top-10 px-4 ";
-    const classShut = "h-0 w-[300px] top-0 px-0";
 
-    window.TwindInst(classDefault);
-    window.TwindInst(classOpen);
-    window.TwindInst(classShut);
+    type MenuClassStates = {Keep:string, Open:string, Shut:string, Move:string, Exit:string};
+    const Classes:MenuClassStates =
+    {
+      Keep: "relative transition-all border",
+      Open: "h-auto w-auto    top-10 duration-1000",
+      Shut: "h-0    w-[300px] top-0  duration-1000",
+      Move: "",
+      Exit: "h-auto w-auto top-36 px-4 opacity-0"
+    };
+    const Window = window as {TwindInst?:(c:string)=>string};
+    if(Window.TwindInst)
+    {
+      for(let stateName in Classes)
+      {
+        Classes[stateName as keyof MenuClassStates] = Window.TwindInst(Classes[stateName as keyof MenuClassStates]);
+      }
+    }
 
     React.useEffect(()=>refControl.current = Collapser(refElement.current as HTMLElement, true), []);
     React.useEffect(()=> {refControl.current && refControl.current(stateGet.open, 1000, ()=>stateSet({done:true}))}, [stateGet.open])
 
-    return <div class={classDefault} data-class={classDefault} data-class-open={classOpen} data-class-shut={classShut} ref={refElement as React.Ref<HTMLDivElement>}>{props.children}</div>;
+    return <div class={Classes.Keep} data-class-keep={Classes.Keep} data-class-open={Classes.Open} data-class-shut={Classes.Shut} ref={refElement as React.Ref<HTMLDivElement>}>
+      { (!stateGet.open && stateGet.done) ? null : props.children}
+    </div>;
 };
 
 export const Button =()=>
@@ -50,21 +62,36 @@ export function Collapser(inElement:HTMLElement, initialState = false)
     let userMode = initialState;
     let frameRequest = 0;
 
-    const done = (inEvent:TransitionEvent)=>
+    let transitions = new Set();
+
+    const run = (inEvent:TransitionEvent)=>
     {
-      if (inEvent.propertyName == "height" && inEvent.target == inElement)
+      if (inEvent.target == inElement)
       {
-        inEvent.stopPropagation();
-        if (userMode)
-        {
-          inElement.style.height = "";
-          inElement.style.width = "";
-          inElement.style.overflow = "visible";
-        }
-        userDone(userMode);
+        console.log("transition", inEvent.target)
+        transitions.add(inEvent.propertyName);
       }
     };
-    inElement.addEventListener("transitionend", done);
+
+    const end = (inEvent:TransitionEvent)=>
+    {
+      if (inEvent.target == inElement)
+      {
+        transitions.delete(inEvent.propertyName);
+        if(transitions.size === 0)
+        {
+          if (userMode)
+          {
+            inElement.setAttribute("style", "");
+          }
+          userDone(userMode);          
+        }
+
+      }
+    };
+
+    inElement.addEventListener("transitionend", end);
+    inElement.addEventListener("transitionrun", run);
 
     return function(inOpen, inMs, inDone)
     {
@@ -79,16 +106,15 @@ export function Collapser(inElement:HTMLElement, initialState = false)
         const h1 = inElement.clientHeight;
         const w1 = inElement.clientWidth;
         const classesInitial = inElement.getAttribute("class");
-        const classesStart = inElement.getAttribute("data-class");
+        const classesKeep = inElement.getAttribute("data-class-keep");
         const classesEnd = inElement.getAttribute(`data-class-${inOpen?"open":"shut"}`);
       
         // 2) disable transitions to get immediate results
-        inElement.style.transition = "none";
-        inElement.style.height = "";
-        inElement.style.width = "";
+        inElement.setAttribute("style", "");
+        inElement.style.transition = "width none, height none";
 
         // 3) add new classes and capture new height
-        inElement.className = classesStart + " " + classesEnd;
+        inElement.className = classesKeep + " " + classesEnd;
         const h2 = inElement.clientHeight;
         const w2 = inElement.clientWidth;
 
@@ -96,26 +122,28 @@ export function Collapser(inElement:HTMLElement, initialState = false)
         inElement.style.height = h1+"px";
         inElement.style.width = w1+"px";
         inElement.style.overflow = "hidden";
-        inElement.className = classesInitial;
+        inElement.className = classesInitial ?? "";
 
         console.log(`BEFORE classes:"${inElement.className}" width:"${w1}" height:"${h1}"`);
 
         frameRequest = requestAnimationFrame(()=>
         {
           inElement.style.transition = "";
+
           frameRequest = requestAnimationFrame(()=>
           {
-              inElement.style.height = `${h2}px`;
-              inElement.style.width = `${w2}px`;
-              inElement.className = classesStart + " " + classesEnd;
-              console.log(`AFTER classes:"${inElement.className}" width:"${w2}" height:"${h2}"`);
+            inElement.style.height = `${h2}px`;
+            inElement.style.width = `${w2}px`;
+            inElement.className = classesKeep + " " + classesEnd;
+            console.log(`AFTER classes:"${inElement.className}" width:"${w2}" height:"${h2}"`);
           });
           
         });
       }
       else
       {
-        inElement.removeEventListener("transitionend", done);
+        inElement.removeEventListener("transitionrun", run);
+        inElement.removeEventListener("transitionend", end);
       }
     } as CollapseControls;
 }
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