diff --git a/source/src/dt_app.cpp b/source/src/dt_app.cpp
index 641bd03..3d17adf 100644
--- a/source/src/dt_app.cpp
+++ b/source/src/dt_app.cpp
@@ -1,9 +1,7 @@
 #include "dt_app.hpp"
 
-#include <imgui\imgui.h>
-#include <imgui\imgui_internal.h>
-#include <dv_gui_opengl\fonts\dv_font_average_mono.hpp>
-#include <dv_gui_opengl\fonts\dv_font_fontawesome_solid.hpp>
+#include <imgui/imgui.h>
+#include <imgui/imgui_internal.h>
 
 using namespace dvsku_toolkit;
 using namespace dvsku;
@@ -25,10 +23,6 @@ dt_gui_mngr& dt_app::get_gui() {
     return m_gui;
 }
 
-void dt_app::close() {
-    dv_window::close();
-}
-
 ///////////////////////////////////////////////////////////////////////////////
 // PRIVATE
 
diff --git a/source/src/dt_app.hpp b/source/src/dt_app.hpp
index e74714f..768e596 100644
--- a/source/src/dt_app.hpp
+++ b/source/src/dt_app.hpp
@@ -1,10 +1,9 @@
 #pragma once
 
-#include "systems\dt_system_mngr.hpp"
-#include "gui\dt_gui_mngr.hpp"
+#include "systems/dt_system_mngr.hpp"
+#include "gui/dt_gui_mngr.hpp"
 
-#include <dv_gui_opengl/dv_window.hpp>
-#include <dv_gui_opengl/models/dv_texture.hpp>
+#include <dv_gui_opengl/dv_gui_opengl.hpp>
 
 namespace dvsku_toolkit {
     class dt_app : public dvsku::dv_window {
@@ -20,18 +19,12 @@ namespace dvsku_toolkit {
 
     public:
         dt_system_mngr& get_systems();
-        dt_gui_mngr& get_gui();
-
-        void close();
+        dt_gui_mngr&    get_gui();
 
     private:
         dt_system_mngr m_systems;
         dt_gui_mngr    m_gui;
 
-        friend dt_comp_root;
-        friend dt_comp_pack;
-        friend dt_comp_unpack;
-
     private:
         bool prepare() override final;
         void release() override final;
diff --git a/source/src/dvsku_toolkit.cpp b/source/src/dvsku_toolkit.cpp
index fda85b5..4b27e1e 100644
--- a/source/src/dvsku_toolkit.cpp
+++ b/source/src/dvsku_toolkit.cpp
@@ -14,7 +14,7 @@ INT WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR lpCmdLine,
         settings.enable_multi_viewport = true;
 
         dt_app app(settings);
-        app.run();
+        app.show();
     }
     catch (...) {
         return -1;
diff --git a/source/src/gui/dt_comp_pack.cpp b/source/src/gui/dt_comp_pack.cpp
index 195b92f..fafb806 100644
--- a/source/src/gui/dt_comp_pack.cpp
+++ b/source/src/gui/dt_comp_pack.cpp
@@ -1,8 +1,6 @@
 #include "gui/dt_comp_pack.hpp"
 #include "dt_app.hpp"
 
-#include <dv_gui_opengl/utilities/dv_util_dialog.hpp>
-
 using namespace dvsku_toolkit;
 
 ///////////////////////////////////////////////////////////////////////////////
@@ -32,17 +30,16 @@ dt_comp_pack::dt_comp_pack(dt_app& app)
         m_app.set_taskbar_progress(0U);
 
         if (result.status == libevp::evp_result_status::ok) {
-            m_app.play_sound(dvsku::dv_sound_type::success);
+            dvsku::dv_util_sound::success();
         }
         else if (result.status == libevp::evp_result_status::error) {
-            m_app.play_sound(dvsku::dv_sound_type::warning);
+            dvsku::dv_util_sound::warning();
 
             if (!result.message.empty()) {
                 m_app.get_systems().core.has_errors = true;
                 m_app.get_systems().core.errors     = result.message;
             }
-        }
-            
+        }    
     };
     m_context.update_callback = [this](float progress) {
         std::lock_guard<std::mutex> guard(m_app.get_systems().core.mutex);
@@ -68,10 +65,7 @@ void dt_comp_pack::render() {
 
     ImGui::SameLine(0.0f, 5.0f);
     if (ImGui::Button("Select##Input", { 125.0f, 21.0f })) {
-        auto result = dvsku::dv_util_dialog::select_dir("Input dir", m_input);
-
-        if (!result.empty())
-            m_input = result;
+        m_input = dvsku::dv_util_dialog::select_dir("Input dir", m_input);
     }
 
     ImGui::Indent(3.0f);
@@ -83,10 +77,7 @@ void dt_comp_pack::render() {
 
     ImGui::SameLine(0.0f, 5.0f);
     if (ImGui::Button("Select##Output", { 125.0f, 21.0f })) {
-        auto result = dvsku::dv_util_dialog::save_file("Output evp", m_output, true, { "EVP (*.evp)", "*.evp" });
-
-        if (!result.empty())
-            m_output = result;
+        m_output = dvsku::dv_util_dialog::save_file("Output evp", m_output, true, { "EVP (*.evp)", "*.evp" });
     }
 
     ImGui::Dummy({ 0.0f, 3.0f });
diff --git a/source/src/gui/dt_comp_root.cpp b/source/src/gui/dt_comp_root.cpp
index 325d476..174454a 100644
--- a/source/src/gui/dt_comp_root.cpp
+++ b/source/src/gui/dt_comp_root.cpp
@@ -2,8 +2,6 @@
 #include "dvsku_toolkit.hpp"
 #include "dt_app.hpp"
 
-#include <dv_gui_opengl\fonts\dv_font_fontawesome_solid.hpp>
-
 using namespace dvsku_toolkit;
 
 ///////////////////////////////////////////////////////////////////////////////
@@ -65,7 +63,7 @@ void dt_comp_root::render() {
             ImGui::SetCursorPosY(min.y);
 
             if (ImGui::Button(ICON_FA_MINUS"##Minimize", { 30.0f, 25.0f })) {
-                m_app.minimize();
+                m_app.iconify();
             }
 
             ImGui::PushStyleVar(ImGuiStyleVar_WindowPadding, { 6.0f, 6.0f });
@@ -94,7 +92,7 @@ void dt_comp_root::render() {
         }
         ImGui::EndChild();
 
-        m_app.m_is_title_bar = ImGui::IsMouseHoveringRect(rectangle.Min, rectangle.Max);
+        m_app.get_title_bar().mouseover_title_bar = ImGui::IsMouseHoveringRect(rectangle.Min, rectangle.Max);
 
         ///////////////////////////////////////////////////////////////////////////
         // CONTENT
diff --git a/source/src/gui/dt_comp_unpack.cpp b/source/src/gui/dt_comp_unpack.cpp
index a73906f..26245b6 100644
--- a/source/src/gui/dt_comp_unpack.cpp
+++ b/source/src/gui/dt_comp_unpack.cpp
@@ -1,8 +1,6 @@
 #include "gui/dt_comp_unpack.hpp"
 #include "dt_app.hpp"
 
-#include <dv_gui_opengl/utilities/dv_util_dialog.hpp>
-
 using namespace dvsku_toolkit;
 
 ///////////////////////////////////////////////////////////////////////////////
@@ -32,10 +30,10 @@ dt_comp_unpack::dt_comp_unpack(dt_app& app)
         m_app.set_taskbar_progress(0U);
 
         if (result.status == libevp::evp_result_status::ok) {
-            m_app.play_sound(dvsku::dv_sound_type::success);
+            dvsku::dv_util_sound::success();
         }
         else if (result.status == libevp::evp_result_status::error) {
-            m_app.play_sound(dvsku::dv_sound_type::warning);
+            dvsku::dv_util_sound::warning();
 
             if (!result.message.empty()) {
                 m_app.get_systems().core.has_errors = true;
@@ -67,10 +65,7 @@ void dt_comp_unpack::render() {
 
     ImGui::SameLine(0.0f, 5.0f);
     if (ImGui::Button("Select##Input", { 125.0f, 21.0f })) {
-        auto result = dvsku::dv_util_dialog::open_file("Input evp", m_input, { "EVP (*.evp)", "*.evp" });
-
-        if (!result.empty())
-            m_input = result[0];
+        m_input = dvsku::dv_util_dialog::open_file("Input evp", m_input, { "EVP (*.evp)", "*.evp" });
     }
 
     ImGui::Indent(3.0f);
@@ -82,10 +77,7 @@ void dt_comp_unpack::render() {
 
     ImGui::SameLine(0.0f, 5.0f);
     if (ImGui::Button("Select##Output", { 125.0f, 21.0f })) {
-        auto result = dvsku::dv_util_dialog::select_dir("Output dir", m_output);
-
-        if (!result.empty())
-            m_output = result;
+        m_output = dvsku::dv_util_dialog::select_dir("Output dir", m_output);
     }
 
     ImGui::Dummy({ 0.0f, 10.0f });
diff --git a/source/src/gui/dt_modal_errors.cpp b/source/src/gui/dt_modal_errors.cpp
index 1c91140..cce6b04 100644
--- a/source/src/gui/dt_modal_errors.cpp
+++ b/source/src/gui/dt_modal_errors.cpp
@@ -1,8 +1,6 @@
 #include "gui/dt_modal_errors.hpp"
 #include "dt_app.hpp"
 
-#include <dv_gui_opengl\fonts\dv_font_fontawesome_solid.hpp>
-
 using namespace dvsku_toolkit;
 using namespace dvsku;
 
diff --git a/source/src/gui/dt_modal_errors.hpp b/source/src/gui/dt_modal_errors.hpp
index 0e366f8..c91dfae 100644
--- a/source/src/gui/dt_modal_errors.hpp
+++ b/source/src/gui/dt_modal_errors.hpp
@@ -2,7 +2,7 @@
 
 #include "gui/dt_gui_base.hpp"
 
-#include <dv_gui_opengl/models/dv_command.hpp>
+#include <dv_gui_opengl/dv_gui_opengl.hpp>
 
 namespace dvsku_toolkit {
     class dt_modal_errors : public dt_gui_base {
diff --git a/source/src/systems/dt_sys_command.hpp b/source/src/systems/dt_sys_command.hpp
index cc2f51c..6885ed6 100644
--- a/source/src/systems/dt_sys_command.hpp
+++ b/source/src/systems/dt_sys_command.hpp
@@ -2,7 +2,7 @@
 
 #include "systems/dt_system_base.hpp"
 
-#include <dv_gui_opengl/systems/dv_sys_command.hpp>
+#include <dv_gui_opengl/dv_gui_opengl.hpp>
 
 namespace dvsku_toolkit {
     class dt_app;
diff --git a/source/src/systems/dt_sys_core.hpp b/source/src/systems/dt_sys_core.hpp
index 99c67e7..fbd7cae 100644
--- a/source/src/systems/dt_sys_core.hpp
+++ b/source/src/systems/dt_sys_core.hpp
@@ -2,7 +2,7 @@
 
 #include "systems/dt_system_base.hpp"
 
-#include <dv_gui_opengl/models/dv_version.hpp>
+#include <dv_gui_opengl/dv_gui_opengl.hpp>
 #include <mutex>
 
 namespace dvsku_toolkit {