Update grid usage at grid example page

druid/base/static_grid.lua

@@ -46,7 +46,7 @@ function M.init(self, parent, element, in_row)
 	self.node_size = gui.get_size(node)
 	self.node_pivot = const.PIVOTS[gui.get_pivot(node)]
 
-	self.border = vmath.vector4(0)
+	self.border = vmath.vector4(0) -- Current grid content size
 	self.border_offset = vmath.vector3(0)
 
 	self.on_add_item = Event()

druid/system/druid_instance.lua

@@ -431,6 +431,15 @@ function Druid.new_grid(self, ...)
 end
 
 
+--- Create staic grid basic component
+-- @function druid:new_staic_grid
+-- @tparam args ... grid init args
+-- @treturn Component grid component
+function Druid.new_static_grid(self, ...)
+	return Druid.create(self, static_grid, ...)
+end
+
+
 --- Create scroll basic component
 -- @function druid:new_scroll
 -- @tparam args ... scroll init args