Dropdowndatagrid search textbox value

I am using radzen dropdowndatagrid i loaded my dataset its work fine but i need to add new record same search box so how i can get value from search box

for example i type in search box "Create-NewRecord" or "AddNew-NewRecord" once i do that grid filtering empty its fine but i need to get search box value when i press my enterkey or mouseenter kindly help me out if someone knew this problem.