Panel - HorizontalBar not appearing

[DBenS]

The HorizontalBar of PANEL is not appearing in Runtime mode - just in DesignMode.
I put many other controls within it. In DesignMode both bars are appearing normally, but during runtime only the VerticalBar is acting.

Thank you.

[DBenS]

Hmmm.... It is related to the size of Panel and the position of controls within it.
It's just like a kind of "margin" would be interfering with it...

And the down-rightmost point of both bars (the panel's bottom-right edge) is transparent, I mean, you can see the control through the vertice square.