diff --git a/window.py b/window.py
new file mode 100644
index 0000000..877e01b
--- /dev/null
+++ b/window.py
@@ -0,0 +1,144 @@
+import sys
+
+from PyQt5.QtWidgets import QApplication, QWidget, QPushButton, QMainWindow, QGridLayout, QLabel, QSpacerItem, QSizePolicy
+
+
+class Window(QMainWindow):
+
+    def __init__(self):
+
+
+
+        super().__init__()
+
+        container = QWidget(self)
+        self.setCentralWidget(container)
+
+        grid = QGridLayout()
+        # add empty label as spacer after buttons
+        grid.addWidget(QLabel(), 10,10)
+        container.setLayout(grid)
+
+
+        # define buttons
+        self.button_zebra = self.make_button("1 Zebra", grid, 0, 0 )
+        self.button_back = self.make_button("Back", grid, 0,0)
+        self.button_dmc = self.make_button("2 DMC", grid, 0,1)
+        self.button_transfer = self.make_button("3 Transfer\nZebra-DMC-Laue", grid,  0,2)
+
+        self.button_zebra11 = self.make_button("1.1", grid, 0, 1)
+        self.button_zebra12 = self.make_button("1.2", grid, 1,1)
+        self.button_zebra13 = self.make_button("1.3", grid, 3,1)
+
+        self.button_dmc21 = self.make_button("2.1", grid, 0,1)
+        self.button_dmc22 = self.make_button("2.2", grid, 1,1)
+
+
+
+        # define button actions
+        self.button_zebra.clicked.connect(self.zebra_view)
+        self.button_back.clicked.connect(self.main_view)
+        self.button_dmc.clicked.connect(self.dmc_view)
+        self.button_transfer.clicked.connect(self.transfer_view)
+
+        self.button_zebra11.clicked.connect(self.zebra11_action)
+        self.button_zebra12.clicked.connect(self.zebra12_action)
+        self.button_zebra13.clicked.connect(self.zebra13_action)
+
+        self.button_dmc21.clicked.connect(self.dmc21_action)
+        self.button_dmc22.clicked.connect(self.dmc22_action)
+
+
+        self.main_view()
+        self.setGeometry(0, 0, 500, 300)
+        self.setWindowTitle("Zebra")
+        self.show()
+        sys.exit(app.exec_())
+
+
+    def hide_all(self):
+        self.button_zebra.setHidden(True)
+        self.button_back.setHidden(True)
+        self.button_dmc.setHidden(True)
+        self.button_transfer.setHidden(True)
+
+        self.button_zebra11.setHidden(True)
+        self.button_zebra12.setHidden(True)
+        self.button_zebra13.setHidden(True)
+
+        self.button_dmc21.setHidden(True)
+        self.button_dmc22.setHidden(True)
+
+
+
+    def main_view(self):
+        self.hide_all()
+        self.button_zebra.setHidden(False)
+        self.button_dmc.setHidden(False)
+        self.button_transfer.setHidden(False)
+
+
+
+
+    def zebra_view(self):
+        self.hide_all()
+        self.button_back.setHidden(False)
+        self.button_zebra11.setHidden(False)
+        self.button_zebra12.setHidden(False)
+        self.button_zebra13.setHidden(False)
+
+    def dmc_view(self):
+        self.hide_all()
+        self.button_back.setHidden(False)
+        self.button_dmc21.setHidden(False)
+        self.button_dmc22.setHidden(False)
+
+
+
+    def transfer_view(self):
+        self.hide_all()
+        self.button_back.setHidden(False)
+
+
+    def zebra11_action(self):
+        pass
+
+    def zebra12_action(self):
+        pass
+
+    def zebra13_action(self):
+        pass
+
+    def dmc21_action(self):
+        pass
+
+    def dmc22_action(self):
+        pass
+
+
+
+
+
+
+    def make_button(self, text, grid, row, col):
+        """Create a button in the grid and hide it."""
+        button = QPushButton(self)
+        button.setText(text)
+        grid.addWidget(button, row, col)
+        button.setHidden(True)
+        button.setFixedHeight(50)
+        button.setFixedWidth(150)
+        return button
+
+
+
+
+
+
+
+if __name__ == '__main__':
+    app = QApplication(sys.argv)
+    hello = Window()
+    sys.exit(app.exec())
+
+