KJKeerthana Jegannathan Syncfusion Team January 5, 2017 08:44 AM UTC
Thank you for contacting Syncfusion support.
We suspect that your requirement is to select all the items in MultiSelectionComboBox. If so, this requirement can be met by using the function named “SelectAll” which checks all the items in the control. We have prepared the sample for the same and it can be downloaded from the below location.