I was able to combine both your samples to get what I needed except for one little enhancement I'd like to have.
Is it possible to add a checkbox called "All Users" that acts like a toggle so that if "All Users" is checked all the others get checked, and if "All Users" is unchecked then all get unchecked?
I think it would also get unchecked if the user selects another entry while it is checked.
SMSugapriya Mariappan Syncfusion Team November 19, 2015 09:46 AM UTC
We would like to inform you that we don’t have this support “Select and unselect all the items in ComboBoxAdv” currently and so have logged feature report regarding this. A support incident to track the status of this feature has been created under your account. Please log on to our support website to check for further updates