Form always on top property - changing at runtime

I am using a form that I have set always on top to true, it is not a modal
form. It appears on top of my main form. (Delphi 1.0).

From this form I can open a search dialog, when this dialog is opened I
would like it to appear on top of the form that was set to alwaysontop :=

I have tried changing alwaysontop to false before openeing the search form
but this causes an annoying flash.

Is there any way to do this and avoid the flash, or will I need to write my
own code to manage my opened forms somehow.

Thanks in advance for any help.

Leon Sinagra.