Run a form automatically when opening dynamics AX + 2012

Create a new  menu item for the form which form you want run opening dynamics AX.

Call that method as shown in below

new MenuFunction(menuitemDisplayStr(YourMenuItemName), MenuItemType::Display).run();

Place this code to Info.startupPost() (if you want it to start when the client starts) 
                                   or 
Info.workspaceWindowCreated() (if you want it to start every time new workspace is opened).