ReactGrid supports fill handle action in PRO version, but it is disabled by default. To turn it on you have to simply add enableFillHandle property to ReactGrid component. Now you are able to use autocomplete feature by default. This feature allows you to set further values to be filled in based on the data contained in the selection. Otherwise, the data is repeated respective to the direction. Data isn't predicted when ctrl key is pressed (or Option/⌥ key on Apple devices).

<ReactGrid
    {...props}
    enableFillHandle //highlight-line
/>

Note that if an incoming change will not be handled by the app, then there will be no visible changes, though the action was correctly performed.