Someone

Ewl_Widget *p1, *p2, *o, *o2;

p1 = ewl_paned_new();
ewl_paned_orientation_set(EWL_PANED(p), EWL_ORIENTATION_VERTICAL);
ewl_container_child_append(EWL_CONTAINER(win), p1);
ewl_widget_show(p1);

p2 = ewl_paned_new();
ewl_container_child_append(EWL_CONTAINER(p1), p2);
ewl_widget_show(p2);

o = ewl_box_new();
ewl_container_child_append(EWL_CONTAINRE(p2), o);
ewl_object_fill_policy_set(EWL_OBJECT(o), EWL_FLAG_FILL_FILL);
ewl_widget_show(o);

o2 = ewl_button_new();
ewl_button_label_set(o2, "Left");
ewl_container_child_append(EWL_CONTAINER(o), o2);
ewl_widget_show(o2);

o = ewl_box_new();
ewl_container_child_append(EWL_CONTAINRE(p2), o);
ewl_object_fill_policy_set(EWL_OBJECT(o), EWL_FLAG_FILL_FILL);
ewl_widget_show(o);

o2 = ewl_button_new();
ewl_button_label_set(o2, "Right");
ewl_container_child_append(EWL_CONTAINER(o), o2);
ewl_widget_show(o2);

o = ewl_box_new();
ewl_container_child_append(EWL_CONTAINRE(p1), o);
ewl_object_fill_policy_set(EWL_OBJECT(o), EWL_FLAG_FILL_FILL);
ewl_widget_show(o);

o2 = ewl_button_new();
ewl_button_label_set(o2, "Bottom");
ewl_container_child_append(EWL_CONTAINER(o), o2);
ewl_widget_show(o2);