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1. Run the sample.--> Enable Checkbox selection with Custom Adaptor
https://www.syncfusion.com/downloads/support/directtrac/general/ze/TreeGridCC_(2)7864920821819671971.zip
2. When render first, the select box working correct, but when expand row, *select box default when choosing the correct number of lines *all of rows will selected.
Video Demo for reference :- https://www.syncfusion.com/downloads/support/directtrac/general/ze/NEWFOL~1-1839090307.zip