About Display regions

I want to split the window into 2 halves and show different images into it, but how can i disable the (0,1,0,1) displayregion when i create the other region i set the sort value of both the regions above 0 but still i continue to get the region which spans the window, how do i stop it.

my code:

// splitdisplay.cpp : Defines the entry point for the console application.
//

#include "stdafx.h" 
#include "pandaFramework.h" 
#include "pandaSystem.h" 
#include "displayregion.h" 

int _tmain(int argc, char* argv[])
{
	PandaFramework framework;
	WindowFramework *window;
	PT(DisplayRegion) dRegR;
	PT(DisplayRegion) dRegL;

	NodePath Camc;
	NodePath Cam2;


	framework.open_framework(argc, argv); 
	framework.set_window_title("My Panda3D Window"); 
	window = framework.open_window();
	
	dRegR= window->get_graphics_output()->make_display_region(.4,1,0,1);
	dRegL= window->get_graphics_output()->make_display_region(0,.4,0,1);

	Camc = window->get_camera(0);
	Cam2 = window->make_camera();

	dRegR->set_camera(Cam2);
	dRegL->set_camera(Camc);
	dRegL->set_sort(10);
	dRegR->set_sort(10);

	Camc.set_pos(0,0,3);
	Cam2.set_pos(0,-20,3);

	NodePath environ = window->load_model(framework.get_models(), "models/environment"); 
	environ.reparent_to(window->get_render()); 
	environ.set_scale(0.25 , 0.25, 0.25); 
	environ.set_pos(-8, 42, 0); 

	NodePath pandaActor = window->load_model(framework.get_models(), "panda-model"); 
	pandaActor.set_scale(0.005); 
	pandaActor.reparent_to(window->get_render()); 

	window->load_model(pandaActor, "panda-walk4"); 
	window->loop_animations(0); 

	framework.main_loop(); 

	framework.close_framework(); 

	return 0;
}
displayregion->set_active(false);

Thanks for the reply,
I did try that but it would not work the whole window becomes black and blank so i even tried making the other regions active, what to do now?

This code gives the black windows:

// splitdisplay.cpp : Defines the entry point for the console application.
//

#include "stdafx.h" 
#include "pandaFramework.h" 
#include "pandaSystem.h" 
#include "displayregion.h" 

int _tmain(int argc, char* argv[])
{
	PandaFramework framework;
	WindowFramework *window;
	PT(DisplayRegion) dRegR;
	PT(DisplayRegion) dRegL;
	PT(DisplayRegion) dRegW;

	NodePath Camc;
	NodePath Cam2;


	framework.open_framework(argc, argv); 
	framework.set_window_title("My Panda3D Window"); 
	window = framework.open_window();
	dRegW = window->get_display_region_3d();
	dRegR= window->get_graphics_output()->make_display_region(.4,1,0,1);
	dRegL= window->get_graphics_output()->make_display_region(0,.4,0,1);

	Camc = window->get_camera(0);
	Cam2 = window->make_camera();

	dRegW->set_active(false);

	dRegR->set_camera(Cam2);
	dRegL->set_camera(Camc);
	dRegL->set_sort(10);
	dRegR->set_sort(10);
	dRegL->set_active(true);
	dRegR->set_active(true);

	Camc.set_pos(0,0,3);
	Cam2.set_pos(0,-20,3);

	NodePath environ = window->load_model(framework.get_models(), "models/environment"); 
	environ.reparent_to(window->get_render()); 
	environ.set_scale(0.25 , 0.25, 0.25); 
	environ.set_pos(-8, 42, 0); 

	NodePath pandaActor = window->load_model(framework.get_models(), "panda-model"); 
	pandaActor.set_scale(0.005); 
	pandaActor.reparent_to(window->get_render()); 

	window->load_model(pandaActor, "panda-walk4"); 
	window->loop_animations(0); 

	framework.main_loop(); 

	framework.close_framework(); 

	return 0;
}

got the soln, you add the line
Camc = window->get_camera(0);
Camc.remove_node();
and make the display region inactive
dRegW = window->get_graphics_output()->get_display_region(0);
dRegW->set_active(false);