This function inserts an item at the given position. The item can be a string/number or RImage (for combo boxes with one column) or an array for combos containing more than one column. Notice that when insert an item, you must provide all the columns for multi-columns combos. When the Sorted property is set to true, the position parameter is ignored and this function is acts similar to AddItem.
Return value:
This function returns -1 if the position is invalid, or the position otherwise.
Example
// for combo with one column, insert at the fifth position
Combo.InsertItem(5, "column");
// for combo with two columns, insert at the fifth position
Combo.UpdateItem(5,["column one","column two"]);
// also, if you added a column as IMAGE_COLUMN
myImage=new RImage(null);
myImage.Filename="picture.jpg";
Combo.InsertItem(5,myImage);