In A Recent Project I also Had The Same Problem With The Progress Bar, Text Boxes And A Slider. I Wanted To Cover The Window With Animated Doors That Opened To Reveal Objects At Start of Layout. I Tried A Multitude of Adjustments But Found A Solution/Work Around To Fix The Issue.
I Created This Quick Example Capx File To Show How To Stop Form Controls From Appearing On Top Of All Objects and Layers On The Canvas,
kmsravindra ashwin2000 Check It Out And See If This Concept Can Solve Are At least Help You Work Around Your Issue With The Form Controls.
<a href="https://www.dropbox.com/s/ee03vrgpj1ubmrq/HIDE%20FORM%20CONTROLS.capx?dl=0">DropBox.Com Capx File</a>