SMART datagrid v.1 > Classes > ColumnHeader
The location or name of image which will be displayed in column header among the items of imageList specified in Grid Header.
You can also directly specify the image path through imageUrl property. If specify imageUrl, this property will be ignored.
Defaults to -1.
// Specify as image location value
column.header().setInidex(1);
// Image name contained in image list
column.setHeader({
imageIndex : "ar.png"
});