Retrieve hidden forms-smartphone

Apps written using smartphone are found in the test. ProgramAfter multiple forms are created, if you use the home key to return to the desktop, you only need to use the back key to return the previous form. When the form is closed, its previous form is not displayed, to directly display the desktop, You need to press the rollback key to display the previous form.
Form creation process a creates B, B creates C, press the Home Key to return to the desktop when the C form is created, then press the back key to return to C, close C to the desktop instead of B. This indicates that capture of B is false. However, setting it to true is useless, and bringtofront is useless.
Solution: My solution does not completely solve the problem, and the solution is not good. It is to use the default smartphone application for a single instance. When C is disabled and the desktop is displayed, if the program is run again, it will be returned to the program form, but sometimes it will be returned to, strange.
Use ShellExecute to run one.