Hi Richard,
In TreeViewAdv, CustomControl addition feature has been implemented with v4.4. It has been improved and modified as Primitives in v5.1. For more details please refer to the v4.4 release notes
http://www.syncfusion.com/support/releasenotes/4.4.0.51/windows/tools.aspxCould you please upgrade to our latest version v5.1? For more details about v5.1 feature details, please refer to the below link
http://www.syncfusion.com/support/releasenotes/5.1.0.51/windows/tools.aspxYou can download the latest version from the below link:
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http://www.syncfusion.com/downloads/latestversion/default.aspxUnlock key:
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If you hold a Syncfusion license with a valid subscription, you can obtain your key for this version by visiting the "Download the latest versions" section within Direct-Trac and clicking on the appropriate key icon. If you're currently evaluating our products or considering renewing an expired subscription, please write to salessupport@syncfusion.com to request a key.
Kindly let me know if this helps you.
Thank you for your interest in Syncfusion products.
Regards,
Murugan P.S.