Items don't always render

[admwx7]

Seems to be an issue with iron-list where dropping in items during the draw state sometimes doesn't draw all of the items on the screen:
https://files.slack.com/files-pri/T08NJERPE-F4Z1767M2/pasted_image_at_2017_04_13_12_04_pm.png

This is intermittent in most cases, however when using the tree inside of a collapse style element it seems to always run into this issue.

[admwx7]

Need to check if this is still an issue, hybridization may of wrapped this up for us in #51