diff --git a/mmn_17.c b/mmn_17.c
index 18075dd..eef594c 100644
--- a/mmn_17.c
+++ b/mmn_17.c
@@ -1,16 +1,21 @@
 #include <GL/freeglut.h>
 #include <GL/freeglut_std.h>
 #include <GL/gl.h>
+#include <GL/glext.h>
 #include <GL/glu.h>
 #include <stdio.h>
 #include <math.h>
 #include "ui.h"
+
+void testButtonClick();
+
+
 // Ui stuff
 ui_button buttons[] = {
     { 
             /* pos */ { { 0.5, 0.5, 0.0 }, { -50.0, -25.0, 0.0 } },
             /* size */ { 100.0, 50.0, 0.0 },
-            /* onclick */ NULL,
+            /* onclick */ testButtonClick,
             /* text */ "Test :)"
         }
 };
@@ -22,12 +27,24 @@ ui_slider sliders[] = {
     }
 };
 
+void testButtonClick() {
+    printf("Clicked!\n");
+    sliders[0].value = 0.5;
+    glutPostRedisplay();
+}
 
-void display(void) {
-    printf("Drawing!\n");
-    // Clear screen
-    glClearColor(0.0, 0.0, 0.0, 1.0); // Dark theme :)
-    glClear(GL_COLOR_BUFFER_BIT);
+void drawUi(void) {
+    glDisable(GL_LIGHTING);
+    
+    glMatrixMode(GL_MODELVIEW);
+    glLoadIdentity();
+    // set ui camera
+    int wWidth = glutGet(GLUT_WINDOW_WIDTH);
+    int wHeight = glutGet(GLUT_WINDOW_HEIGHT);
+    glMatrixMode(GL_PROJECTION);
+    glLoadIdentity();
+    gluOrtho2D(0.0, wWidth, 0.0, wHeight);
+    
     // Draw buttons
     for(ui_button* b = buttons; b < buttons + sizeof buttons / sizeof(ui_button); b += 1) {
         ui_button_draw(b);
@@ -40,12 +57,48 @@ void display(void) {
     if(err != 0) {
         printf("opengl error %d: %s\n", err, gluErrorString(err));
     }
+}
+
+void drawWorld(void) {
+    // set perspective camera
+    GLdouble wWidth = (GLdouble) glutGet(GLUT_WINDOW_WIDTH);
+    GLdouble wHeight = (GLdouble) glutGet(GLUT_WINDOW_HEIGHT);
+    glMatrixMode(GL_MODELVIEW);
+    glLoadIdentity();
+    gluLookAt(0.0, 10.0, 20.0, (0.5 - sliders[0].value) * 10.0, 0.0, 0.0, 0.0, 1.0, 0.0);
+    glMatrixMode(GL_PROJECTION);
+    glLoadIdentity();
+    gluPerspective(90, wWidth / wHeight  , 1.0, 100.0);
+    // Lights
+    glEnable(GL_LIGHTING);
+    glEnable(GL_LIGHT0);
+    GLfloat light1[] = { 0.0, 1.0, 0.0, 0.0 };
+    glLightfv(GL_LIGHT0, GL_POSITION, light1);
+    // World
+    glBegin(GL_QUADS);
+        glColor3f(1.0, 1.0, 0.0);
+        glNormal3f(0.0, 1.0, 0.0);
+        glVertex3f(-50.0, 0.0, -50.0);
+        glVertex3f(50.0, 0.0, -50.0);
+        glVertex3f(50.0, 0.0, 50.0);
+        glVertex3f(-50.0, 0.0, 50.0);
+    glEnd();
+}
+
+void display(void) {
+    // Clear screen
+    glClearColor(0.0, 0.0, 0.0, 1.0); // Dark theme :)
+    glClear(GL_COLOR_BUFFER_BIT);
+
+    drawWorld();
+    drawUi();
+
     glutSwapBuffers();
     glFlush();
 }
 
 void mouseEvent(int button, int state, int x, int y) {
-    if(state == 1) {
+    if(state == 0) {
         for(ui_button* b = buttons; b < buttons + sizeof buttons / sizeof(ui_button); b += 1) {
             if(ui_button_mouse_over(b, x, y) && b->onClick != NULL) {
                 b->onClick();
@@ -61,7 +114,6 @@ void mouseEvent(int button, int state, int x, int y) {
 }
 
 void mouseWheelEvent(int wheel, int dir, int x, int y) {
-    printf("wheel event\n");
     for(ui_slider* s = sliders; s < sliders + sizeof sliders / sizeof(ui_slider); s += 1) {
         if(ui_slider_mouse_over(s, x, y)) {
             s->value += dir * 0.05;