I have a tree (FB 4.5) which has lots of branches (> 20) with many children (also > 20 per branch). The animation for opening or closing a branch doesn't seem tom occur until the item has been opened at least once. Is there any way to force the animation to occur all the time?
This is because the children don't render until you actually open it. There's a creationpolicy property you can set in the container that controls this. If you set to all, all the childrens will be created, but the initialization time will be longer
Short story: I was asked to convert huge datagrids samples to Flex, with thousands of columns. Flex datagrid is poor in performance, and at some point it stuck. I was forced to use a list with a special renderer to show the whole stuff, no workarounds, just datagrid sucks (but probably new Spark doesn't? Didn't try)