How to Use Z-Index in Designer

The Z-Index property specifies the stack order of elements/controls. An element/controls with greater stack order will always be in front of an element/controls with a lower stack order (i.e. an element/controls with a Z-index of 10 will be on top of (in front of) an element/controls with a Z-index of 5.

You can set the stack number on any controls' settings panel.