what's the different between window and panel in Extjs ? is it fine if i use window to display and handle too much data from database ?
Window is a specialized panel intended for use as an application window. Windows are floated, resizable, and draggable by default. Windows can be maximized to fill the viewport, restored to their prior size, and can be minimized.
So if you don't need any of the features the window has - use a panel.