make double click fillhandle work with data key value pairs

Double click fillhandle didn't work for data array's in following format because it was only compatible with array indexes.

	data [
		{
			img: 'imagename.jpg',
			title: 'some title',
		},
		{
			img: 'imagename2.jpg',
			title: 'some title 2',
		}	
	]