How can I use a drag and drop mechanism to activate a new figure?

I made several GUI's in matlab's guide. One of them is my main menu(containts pushbuttons) in which you can choose a mode. I implemtent a drag and drop mechanism, so you can move the pushbuttons. This works quite well. Now I'm looking to a method to move one button into an area, so it activates the selected mode. That means that the current figure is closed and a new figure would appear. But I don't know how to manage this. Here you can see my drag and drop mechanism

function dragObject(hObject,eventdata)
handles = guidata(gcf);
handles.dragging = hObject;
handles.orPos = get(gcf,'CurrentPoint');
guidata(gcf,handles);

function dropObject(hObject,eventdata)
handles = guidata(gcf);
        if ~isempty(handles.dragging)
            newPos = get(gcf,'CurrentPoint');
            posDiff = newPos - handles.orPos;
            set(handles.dragging,'Position',get(handles.dragging,'Position') + [posDiff(1:2) 0 0]);
            handles.dragging = [];
            guidata(gcf,handles)
        end

function moveObject(hObject,eventdata)
handles = guidata(gcf);
        if ~isempty(handles.dragging)
            newPos = get(gcf,'CurrentPoint');
            X= newPos(1,1);
            Y=newPos(1,2);
            posDiff = newPos - handles.orPos;
            handles.orPos = newPos;
            set(handles.dragging,'Position',get(handles.dragging,'Position') + [posDiff(1:2) 0 0]);
            guidata(gcf,handles)
        end