Removing a droptarget from DOM.

Explanation

I'm creating an application which let's you initially have 1 droptarget, and the items you insert could also be droptargets.

All items inserted in the mainPanel can be move around in the same way as the flexTable example in the gwt-dnd samples. Also all items can be removed, and if the removed item was a droptarget, it will delete all it's childrens.

Here's the code of the delete method:

            innerDragController.unregisterDropController(propertiesWidget.getFlexTable().getRowController());
            innerDragController.unregisterDropController(propertiesWidget.getFlexTable().getColumnController());
            outerDragController.unregisterDropController(propertiesWidget.getFlexTable().getRowController());
            outerDragController.unregisterDropController(propertiesWidget.getFlexTable().getColumnController());
            propertiesWidget.getFlexTable().setRowController(null);
            propertiesWidget.getFlexTable().setColumnController(null);

            propertiesWidget.deleteChildWidgets();

            if (propertiesWidget.getRelatedTable().getName().equals("HPanel")) {
                FlexTableUtil.removeColumnWhereWidgetExist(propertiesWidget.getRelatedTable().getMainTable(), propertiesWidget);
            } else if (propertiesWidget.getRelatedTable().getName().equals("VPanel")){
                FlexTableUtil.removeRowWhereWidgetExist(propertiesWidget.getRelatedTable().getMainTable(), propertiesWidget);
            }

 and this is the deleteChildWidget method

public void deleteChildWidgets() {
    if (flexTable != null) {
        List<Widget> childs = flexTable.getChilds();
        for (Widget child : childs) {
            System.out.println("Removed: " + child.getNamingLabel().getText());
            child.deleteChildWidgets();
            if (flexTable.getName().equals("HPanel")) {
                FlexTableUtil.removeColumnWhereWidgetExist(flexTable.getMainTable(), child);
            } else if (flexTable.getName().equals("VPanel")){
                FlexTableUtil.removeRowWhereWidgetExist(flexTable.getMainTable(), child);
            }
            child.removeFromParent();
            innerDragController.makeNotDraggable(child);
            outerDragController.makeNotDraggable(child);
            child = null;
        }
        innerDragController.unregisterDropController(flexTable.getRowController());
        innerDragController.unregisterDropController(flexTable.getColumnController());
        outerDragController.unregisterDropController(flexTable.getRowController());
        outerDragController.unregisterDropController(flexTable.getColumnController());
        flexTable.setRowController(null);
        flexTable.setColumnController(null);
        innerDragController.makeNotDraggable(this);
        flexTable = null;
    }
}

Problem

The problem occur when after deleting one droptarget and then trying to move the already inserted items between other droptargets, or arraging the other in the existing droptarget. It gives me the error " Caused by: java.lang.IllegalStateException: Unattached drop target. You must call DragController#unregisterDropController for all drop targets not attached to the DOM.".

I'm clueless on what to do since I already unregistered the droptarget, and all inner droptargets. 

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