diff --git a/examples/xtd.forms.examples/drawing/draw_ellipse/src/draw_ellipse.cpp b/examples/xtd.forms.examples/drawing/draw_ellipse/src/draw_ellipse.cpp
index 276f5d106b4a..bb9d3d7f3e39 100644
--- a/examples/xtd.forms.examples/drawing/draw_ellipse/src/draw_ellipse.cpp
+++ b/examples/xtd.forms.examples/drawing/draw_ellipse/src/draw_ellipse.cpp
@@ -2,6 +2,7 @@
 #include <xtd/forms/form>
 
 using namespace xtd::drawing;
+using namespace xtd::drawing::drawing_2d;
 using namespace xtd::forms;
 
 namespace draw_ellipe_example {
diff --git a/examples/xtd.forms.examples/drawing/draw_line/src/draw_line.cpp b/examples/xtd.forms.examples/drawing/draw_line/src/draw_line.cpp
index 4e9d297b0978..a99f6f79d09c 100644
--- a/examples/xtd.forms.examples/drawing/draw_line/src/draw_line.cpp
+++ b/examples/xtd.forms.examples/drawing/draw_line/src/draw_line.cpp
@@ -2,6 +2,7 @@
 #include <xtd/forms/form>
 
 using namespace xtd::drawing;
+using namespace xtd::drawing::drawing_2d;
 using namespace xtd::forms;
 
 namespace draw_line_example {
diff --git a/examples/xtd.forms.examples/drawing/draw_rectangle/src/draw_rectangle.cpp b/examples/xtd.forms.examples/drawing/draw_rectangle/src/draw_rectangle.cpp
index 4b377783f884..9811c0d407d2 100644
--- a/examples/xtd.forms.examples/drawing/draw_rectangle/src/draw_rectangle.cpp
+++ b/examples/xtd.forms.examples/drawing/draw_rectangle/src/draw_rectangle.cpp
@@ -2,6 +2,7 @@
 #include <xtd/forms/form>
 
 using namespace xtd::drawing;
+using namespace xtd::drawing::drawing_2d;
 using namespace xtd::forms;
 
 namespace draw_rectangle_example {
diff --git a/examples/xtd.forms.examples/drawing/draw_rounded_rectangle/src/draw_rounded_rectangle.cpp b/examples/xtd.forms.examples/drawing/draw_rounded_rectangle/src/draw_rounded_rectangle.cpp
index aadb8a0127ce..4141cbff44a2 100644
--- a/examples/xtd.forms.examples/drawing/draw_rounded_rectangle/src/draw_rounded_rectangle.cpp
+++ b/examples/xtd.forms.examples/drawing/draw_rounded_rectangle/src/draw_rounded_rectangle.cpp
@@ -2,6 +2,7 @@
 #include <xtd/forms/form>
 
 using namespace xtd::drawing;
+using namespace xtd::drawing::drawing_2d;
 using namespace xtd::forms;
 
 namespace draw_rounded_rectangle_example {