Z-Order not preserved when swiching between applications

[Alexmwillis]

Hi,

Can anyone help explain why, when I've created a simple VCL Form application, switching between this application and others sometimes changes the order of the application's forms.

To recreate I did the following;

Created a test app (delphi 2009) with a main form and 2 child forms, only code to set-up application was

Application.Initialize;
Application.MainFormOnTaskbar := True;
Application.CreateForm(TfrmZ_Order_Main, frmZ_Order_Main);
Application.CreateForm(TfrmZ_Order_Form1, frmZ_Order_Form1);
Application.CreateForm(TfrmZ_Order_Form2, frmZ_Order_Form2);
Application.Run;

Also a button on Main form used to display child forms

Behavior can be recreated as follows;

1. Launch application
2. Click showChildForms button
3. Position child forms to be overlapping.
4. Make sure no applications are selected, then select child forms in sequence.
4. select a different application from the taskbar
5. Forms interchange z-order.

Thanks