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Customer was facing the typo issue while using argument in actionBegin event of Grid.
In this event, customer was trying to set the datasource for the filter dialog at the time the typo issue was occurred.
Since the option is in protected we cant able define the type. Please refer the below sample for more information.
Sample: https://www.syncfusion.com/downloads/support/forum/168373/ze/168373710632848.zip