This extension may be used by VIATRA2 R3 GUI extenders to contribute actions to the tree editor's context menu. blabla This integer determines the order of appearance of items in the menu. A lower number means the item will be towards the beginning of the menu. Plugins may indicate a symbolic key here that will be used to categorize the controbutions into submenus. [Enter the first release in which this extension point appears.] [Enter extension point usage example here.] [Enter API information here.] [Enter information about supplied implementation of this extension point.]