DataLudi Grid v.1 > Classes > OperateOptions
Column filter handle renderer. 
The filter handle renderer embodied at current is only DefaultFilterHandleRenderer.
Defaults to null.
    grid.setOperateOptions({
        filterHandleRenderer: {
            type: ""    // if it is not specified, DefaultFilterHandleRenderer.
            backgroundColor: "#ff0000",
            borderColor: "#880000"
        }
    });