By default, the AllowCreatePool property is SHIFT + exLeftClick + exDblClick, which means that a SHIFT + double click on the surface will create new pools ( you can SHIFT + double-click and drag to create a custom-sized pool ). The AllowCreatePool property specifies the combination of keys that allows the user to create objects on the surface. Set the AllowCreatePool property on exDisallow to prevent creating new pools at runtime. Use the Background(exCreateObjectColor) property to specify color or visual appearance of the creation rectangle when the user creates a new object. The CreatePool event occurs when the user creates the pool on the surface. The control fires the LayoutStartChanging(exCreatePool) / LayoutEndChanging(exCreatePool) event when the user creates a new pool on the surface. 

The Add method adds programmatically a new pool on the surface.

The order of the events when the user creates the pool at runtime is:

• LayoutStartChanging(exCreatePool), the user clicks on the surface
• AddPool, adds the new pool to the Pools collection
• CreatePool, the user ends creating the object
• LayoutEndChanging(exCreatePool), the user un-clicks the surface

The following screen shot shows the creating rectangle, for pools: