in game menu

i seen on some maps theye have an in game menu that apeer on certen parts of the map like in DM Dungeon and DM asenvale or FM Vampire Hunters also some tower defense maps
thees menus allow some one to pick there heros or even create monsters can some please help me how to do this nifty trick.. or tell me the names of the triggers please it would be very helpfull thanks

They are called dialogs. Use the dialog trigger stuff.

This isnt a place for questions either, so I'll move it to map devo.

Here's some examples