CaptionClass not working in SubForm

Hello,

I have a SamplePage with Sample Subform Page on it.

I used a grid layout in the subform. My label has a property caption class = text constant. If i run the subform page, it displays the label.

But when I run the Sample Page (Main page), the subform part does not show the labels.

Any thoughts? or recommendation on how to add a label instead of caption class property?