diff -Naur fluxbox-1.0.0/src/Window.cc fluxbox-1.0.0_dblmax/src/Window.cc
--- fluxbox-1.0.0/src/Window.cc	2007-09-09 17:46:50.000000000 +0200
+++ fluxbox-1.0.0_dblmax/src/Window.cc	2008-02-15 17:10:14.000000000 +0100
@@ -3963,6 +3963,7 @@
     CommandRef raise_and_focus_cmd(new WindowCmd(*this, &FluxboxWindow::raiseAndFocus));
     CommandRef stick_cmd(new WindowCmd(*this, &FluxboxWindow::stick));
     CommandRef show_menu_cmd(new WindowCmd(*this, &FluxboxWindow::popupMenu));
+    CommandRef maximize_cmd(new WindowCmd(*this, &FluxboxWindow::maximizeFull));
 
     typedef FbTk::Resource<vector<WinButton::Type> > WinButtonsResource;
 
@@ -4024,6 +4025,7 @@
     frame().setOnClickTitlebar(shade_cmd, 1, true); // doubleclick with button 1
     frame().setOnClickTitlebar(show_menu_cmd, 3); // on release with button 3
     frame().setOnClickTitlebar(lower_cmd, 2); // on release with button 2
+    frame().setOnClickTitlebar(maximize_cmd, 1,true); // maximize dblclick b1
 
     int reverse = 0;
     if (screen().getScrollReverse())