Hi Robert,
Sorry for the inconvenience caused.
We have tested the reported issue but we are unable to reproduce the issue exactly. Could you please check the below tested sample and video?
Video:
<
http://www.syncfusion.com/uploads/redirect.aspx?&team=support&file=GTC_Columnwidth-1896695229.zip >
Sample:
<
http://www.syncfusion.com/uploads/redirect.aspx?&team=support&file=TreeGridBinding889061765.zip >
If you still face any difficulties, could you please modify our sample based on your need and revert us with replication procedure and video?, that would be very helpful to save you better.
Please let us know if you have any queries.
Thanks,
Rajasekar