addCss

applied CSS class to a component item

void addCss(string|number id,string css, [boolean silent] );

id	string\|number	ID of the neccessary item
css	string	CSS class name
silent	boolean	optional,if true,the component is not redrawn

// this points to a component object
// context.target is a data item id in drag-n-drop context
this.addCss(context.target, "my_custom_mark");