Css property of date picker

I am sorry but there is no demo for that. However if you read the articles I 've send you before you should be able to create one.

You can also part the cell into: renderer, validator and editor and add them separately in the cell’s settings, then it looks like this

function myRenderer(){ ... }
function myValidator(){ ... }
function myEditor(){ ... }

columns: [
 { 
  renderer: myRenderer,
  validator: myValidator,
  editor: myEditor
]

Examples of validator, editors and renderers are in the documentation that I have send you.