fix example

tree.cpp

@@ -375,6 +375,26 @@ void Tree::removeRelation(const unsigned first, const unsigned second)
 	}
 }
 
+static void displayHelp()
+{
+	WINDOW* help_tab = newwin(LINES, COLS, 0, 0);
+
+	printw("%s\n", "Enter - focus the currently selected person",
+		   "Arrow keys - move the camera",
+		   "H, J, K, L - move the selection",
+		   "I - display info about the selected person");
+
+	mvwaddstr(help_tab, LINES-1, 0, "Press any key to return.");
+
+	wrefresh(help_tab);
+	getch();					/* waint press */
+
+	werase(help_tab);
+	wrefresh(help_tab);			/* todo: dont update */
+	delwin(help_tab);
+
+}
+
 void Tree::display()
 {
 	draw();
@@ -386,6 +406,9 @@ void Tree::display()
 
 		switch(c)
 		{
+		case KEY_F(1):
+			displayHelp();
+			break;
 		case '\n':
 			focused_ = selected_;
 			draw();