>>As I wrote, you must clearly create your own function for this. Should be fairly easy, though.
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>It may be suffifient to calculate proper wait window position and use wait window for this.
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>If custom method should used, how to draw wait window inside form ? Should define window command with form name used or shape object or Form.Box() method or something other

Just add an editbox to the form, position it and make it appear on top. Should be just a few lines of code. To make the function generic, pass the form (thisform or this) and the text you want to show. The function can then easily calculate its own position.