Switching rendering back-ends within the same window does not always work correctly about bgfx HOT 7 OPEN

diff --git a/examples/00-helloworld/helloworld.cpp b/examples/00-helloworld/helloworld.cpp
index 884a9ab0a..45f41741a 100644
--- a/examples/00-helloworld/helloworld.cpp
+++ b/examples/00-helloworld/helloworld.cpp
@@ -37,6 +37,7 @@ public:
 		init.resolution.width  = m_width;
 		init.resolution.height = m_height;
 		init.resolution.reset  = m_reset;
+		init.type = bgfx::RendererType::Direct3D11;
 		bgfx::init(init);
 
 		// Enable debug text.
diff --git a/examples/01-cubes/cubes.cpp b/examples/01-cubes/cubes.cpp
index 4f8084001..1dcd1a5e5 100644
--- a/examples/01-cubes/cubes.cpp
+++ b/examples/01-cubes/cubes.cpp
@@ -152,6 +152,7 @@ public:
 		init.resolution.width  = m_width;
 		init.resolution.height = m_height;
 		init.resolution.reset  = m_reset;
+		init.type = bgfx::RendererType::Vulkan;
 		bgfx::init(init);
 
 		// Enable debug text.
diff --git a/examples/02-metaballs/metaballs.cpp b/examples/02-metaballs/metaballs.cpp
index 95ca1dbe0..702a92c2d 100644
--- a/examples/02-metaballs/metaballs.cpp
+++ b/examples/02-metaballs/metaballs.cpp
@@ -511,6 +511,7 @@ public:
 		init.resolution.width  = m_width;
 		init.resolution.height = m_height;
 		init.resolution.reset  = m_reset;
+		init.type = bgfx::RendererType::OpenGL;
 		bgfx::init(init);
 
 		// Enable debug text.

diff --git a/examples/00-helloworld/helloworld.cpp b/examples/00-helloworld/helloworld.cpp
index 884a9ab0a..e5a717798 100644
--- a/examples/00-helloworld/helloworld.cpp
+++ b/examples/00-helloworld/helloworld.cpp
@@ -37,6 +37,7 @@ public:
 		init.resolution.width  = m_width;
 		init.resolution.height = m_height;
 		init.resolution.reset  = m_reset;
+		init.type = bgfx::RendererType::Vulkan;
 		bgfx::init(init);
 
 		// Enable debug text.
diff --git a/examples/01-cubes/cubes.cpp b/examples/01-cubes/cubes.cpp
index 4f8084001..1ec84f1cc 100644
--- a/examples/01-cubes/cubes.cpp
+++ b/examples/01-cubes/cubes.cpp
@@ -152,6 +152,7 @@ public:
 		init.resolution.width  = m_width;
 		init.resolution.height = m_height;
 		init.resolution.reset  = m_reset;
+		init.type = bgfx::RendererType::OpenGL;
 		bgfx::init(init);