[FLEX-27341] Vertical ScrollBar Policy AUTO is not working

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Adobe Flex SDK 3.2 (Release)
• Component/s: mx: Tree
• Environment: Affected OS(s): Windows; Affected OS(s): Windows XP; Browser: Firefox 3.x; Language Found: English
• Assignee: Adobe JIRA
• Reporter: Adobe JIRA
• Created: 20/Apr/11 04:43
• Updated: 25/Apr/11 11:36
• Resolved: 20/Apr/11 23:41

Description

Steps to reproduce:
1. Create a tree component with values dynamically fetched from a dynamic source.
2. Click folders on the tree and sub-folders until you enable the vertical scroll policy.

Actual Results:
Folders/sub-folders at the end of the list and some medium sections disappears.

Expected Results:
All folder hierarchy should be visible and vertical scrollbars should be enabled where appropriate.

Workaround (if any): None

Tried these workarounds, none worked:
1. http://www.nbilyk.com/flex-scrollpolicy-bug
2. http://frishy.blogspot.com/2007/09/autoscrolling-for-flex-tree.html
3. http://www.hempton.com/2008/05/flex-scrollpolicyauto-not-good-enough/
4. http://butterfliesandbugs.wordpress.com/2007/06/22/bug-tree-scrollbar-doesnt-show-up/

Example Code:
In an MXML file:
<mx:Tree id="folders_tr"
width="30%" height="100%"
dataProvider="

{folders}

"
dataDescriptor="

{categoryTreeDescriptor}

"
labelField="@name"
itemOpening="handleFolderOpening(event);"
itemClick="handleFolderClick(event)"
defaultLeafIcon="

{folderClosedIcon}"
folderClosedIcon="{folderClosedIcon}

"
folderOpenIcon="

{folderOpenIcon}

">
</mx:Tree>

In an AS file (FolderTreeDescriptor.as):
public class FolderTreeDescriptor extends DefaultDataDescriptor
{
public override function isBranch(node:Object, model:Object = null):Boolean
{
var folder:XML = node as XML;

if(folder.@hasChildren == "true")

{ return true; }

return false;
}
}