when we have an army with multiple units, give a button when we click a unit in the army to display it, 


example: i have an army with 7 units in it, 2 apv, 3 tank, 1 helicopter, and 1 infantry, and then when i click on apv, there will be a display button and when i click on it, it will display the apv in the army, or if i click the helicopter units in the army and then press the display button, it will change to display the helicopters as a main appearance for the army in the game. same things too with naval army, but if the naval army combined with the land army and then we want to display the land army, the display for the land army in the water must be the transport ship that used to carry the army in the sea.