You can set a window's default size with: set_default_size($width, $height); ?>]]> And to set a window's initial position: set_position($position); ?>]]> Where %$position% can be %'center'% (center of screen), %'mouse'% (under the cursor), or %'none'% (let the window manager place it). If you want to make window respond to resizing in a certain way, you have to set its ~policy~. set_policy($allow_shrink, $allow_grow, $auto_shrink); ?>]]> While each argument is a boolean, there are only two useful combinations of them: one to allow the window to be resized by a user, and one to disallow resizing. set_policy(false, true, false); // allow user resizing $window->set_policy(false, false, true); // disallow user resizing ?>]]>