Upgrading custom Grid CSS style from TreeGrid 13.x to 14.x
Splitting the Grid.css to new Grid.css and Dialog.css
Paste to left tag the original Grid.css from 13.x you used as a source for your custom CSS style.
Press Split... button and save (copy&paste) the results to new files Grid13.css (left) and Dialog13.css (right) placed anywhere.
Paste to left tag your custom Grid.css from 13.x.
Press Split... button and save (copy&paste) the results to Grid.css and Dialog.css in your custom style directory (replace your old Grid.css from 13.x).
Compare the saved Grid13.css and Dialog13.css with the TreeGrid 14.x Grid.css and Dialog.css from the same style line by line.
Apply the changes between 13.x and 14.x original CSS to your custom Grid.css and Dialog.css.
Grid.css - paste here the Grid.css 13.x and click Split button