/// Drag Icon
visible = oInventoryBox.visible;

if(position_meeting(mouse_x,mouse_y,oInventoryIconParent)){
    if(mouse_check_button_pressed(mb_left)){ // grab the item //
        global.heldIcon = id;
    }
}

if(global.heldIcon == id){
    box = instance_nearest(mouse_x,mouse_y,oInventoryBox);
    if(mouse_check_button(mb_left)){ // drag the item //
        x = mouse_x;
        y = mouse_y;
    }
    if(mouse_check_button_released(mb_left)){ // release the item //
        if(instance_exists(box)){
            global.boxes[boxNumber].item = box.item; // give the old box the new boxes item
            global.boxes[boxNumber].item.boxNumber = boxNumber;// give the new boxes item it's new box number
            box.item = id;                           // put the item in the new box
            boxNumber = box.boxID;                             // give this item it's new box number
        }
        box = -1; // reset box and the item being dragged.
        global.heldIcon = -1;
    }
}