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Multi-Column ComboBox with Server-Side Filtering: DataManagerRequest Issue

Details : 
Based on this requirement, we have prepared a sample demonstrating a multi-column ComboBox with server-side filtering. However, we encountered an issue where the DataManagerRequest dm object does not receive the filter value in the server-side Where query.
Upon further investigation, we found that the value is not sent in the request from the source. Additionally, when typing in the multi-column ComboBox, the DataManagerRequest dm object is null when typing in the input, The value and query are only correctly received during when passing query in the Filtering event. That time also , issue we observed is that the filtered data is not being bound back to the multi-column ComboBox.
Replication Procedure:
  1. Run the provided sample application.
  2. Place the cursor within any portion of the text in the RichTextEditor.
  3. Use the custom toolbar dropdown and select an item.

Sample : 

https://www.syncfusion.com/downloads/support/directtrac/general/ze/Multicolumn-serversidefiltering

Expected Output:
  • DataManagerRequest should contain the filter value in the Where clause during typing.
  • The filtered data returned from the server should be properly bound to the Multi-Column ComboBox.
Current Output:
  • DataManagerRequest is null during typing.
  • Filter value is not passed from the source.
  • Returned data is not displayed in the ComboBox popup.