bugfix: design category closes as another opens

packages/builder/src/components/userInterface/DesignView.svelte

@@ -11,6 +11,7 @@
 
   let selectedCategory = "normal"
   let propGroup = null
+  let currentGroup
 
   const getProperties = name => panelDefinition[name]
 
@@ -33,6 +34,7 @@
   ]
 
   $: propertyGroupNames = Object.keys(panelDefinition)
+  
 </script>
 
 <div class="design-view-container">
@@ -51,7 +53,9 @@
             styleCategory={selectedCategory}
             {onStyleChanged}
             {componentDefinition}
-            {componentInstance} />
+            {componentInstance}
+            open={currentGroup === groupName}
+            on:open={() => currentGroup = groupName} />
         {/each}
       {:else}
         <div class="no-design">

packages/builder/src/components/userInterface/PropertyGroup.svelte

@@ -8,11 +8,12 @@
   export let properties = []
   export let componentInstance = {}
   export let onStyleChanged = () => {}
+  export let open = false
 
   $: style = componentInstance["_styles"][styleCategory] || {}
 </script>
 
-<DetailSummary {name}>
+<DetailSummary {name} on:open show={open} >
   {#each properties as props}
     <PropertyControl
       label={props.label}