I am not sure whether it is a Delphi bug or a problem when I create an MDI form in Delphi.

Use the MDI form in Delphi. The project file is as follows:

Application. initialize;
Application. createform (tmainform, mainform );
Application. createform (taboutbox, aboutbox );
Aboutbox. show;
Aboutbox. Hide;
Mainform. showmodal;
Application. Run;

 

If the order of creation of aboutform and mainform is reversed, opening an mdichild form in the main form will result in the following error.

Can not create form, no MDI forms are currently active. Otherwise, everything is normal.

I don't know if it's a Delphi bug or my problem?