For more detail this asset from the Unity Asset Store: Click Here
This is a paid asset, but now you can download uGUI Message Box Modal Dialog and Menu for FREE, Please keep in mind this package is provided only for learning purposes or to be able to test before buying the product, NOT FOR COMMERCIAL PURPOSES.
uGUI Message Box
“If possible, please buy the package to support the developer”
This is a message box and menu system for the new uGUI system in Unity 4.6.
As simple and easy to use as writing MessageBox.Show(“Your message here!”); anywhere in your code.
Web Demo – Online Manual
Features
– Fully customizable prefabs.
– Single prefabs are instantiated to maximize simplicity.
– Similar API to the traditional .net WinForms MessageBox.
– Generate quick and flexible menus from code for pause menu, save and load game menus, options, etc.
– Modal dialog that block all other GUI input until the user selects an option, using dimmers that can be configured in the prefabs.
– Commented C# Source Code Included.