Application written Delphi XE8 touch in edit boxes keyboard not appear in Windows 10

Question

I have Win 32 bit desktop app written in Delphi XE8 with subscription update 1. Windows 10 is set to tablet mode. When I touch edit boxes or memo boxes on my app, keyboard does not appear. It only appears if I touch a password field e.g. edit control with password char set to * or editable combobox. When I run notepad.exe and touch it, keyboard appears, but not for any editable controls on my app ... except for password fields... What is the trick here?

Anacardiaceous

See Automatically pop up tablet touch keyboard on WinForms input focus. – Prologue