Hi Mehul,
Office 2016 with default styles and ItemsIndent 11 should render all lines as expected. Value smaller than 1 should break the root lines.
We plan to release a fix in the upcoming build next week. It will include property to control the size of the expander button because its size is coupled with the root lines rendering logic. The root line of the first item starts from the center of the expander button. The rule will be simple - ItemsIndent value must be greater than half of the expander button width. For example button width 21 requires a width of minimum 11.
Regards,
Petar Mladenov
Progress Telerik
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when would we expect that this task will complete ?
As we need to update the itemsindent property to 11.
hope this will complete soon.