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I am tried achieve the multi-select s per image attached.
While checking the document i found that, multi-select only one mode (either CheckBox or Box) and also How to add checkbox for group title incase of grouping.
POPrince Oliver Syncfusion Team January 23, 2019 04:51 PM UTC
Hi Mohammad,
Thank you for contacting Syncfusion support.
Currently we have not provided support for “Multiselect grouping with checkbox”as per your requirement. We are considering this as a feature in our control. This will be included in any of our upcoming future releases.